Set MSRV to 1.62.1

[jaudiger]

I validated it with the cli cargo msrv:

cargo msrv
  [Meta]   cargo-msrv 0.16.0-beta.8 (a1b5066)                                                                                                                                                                                                                                                                       
Compatibility Check #1: Rust 1.62.1
  [OK]     Is compatible 

Compatibility Check #2: Rust 1.59.0                                                                                                                                                                                                                                                                                   [FAIL]   Is incompatible 
                                                                                                            
  ╭────────────────────────────────────────────────────────────────────────────────────────────────────────╮
  │     Updating crates.io index                                                                           │
  │ error: failed to select a version for the requirement `rstest = "^0.16.0"`                             │
  │ candidate versions found which didn't match: 0.13.0, 0.12.0, 0.11.0, ...                               │
  │ location searched: crates.io index                                                                     │
  │ required by package `reedline v0.17.0 (/home/jaudiger/Development/git-repositories/jaudiger/reedline)` │
  │                                                                                                        │
  ╰────────────────────────────────────────────────────────────────────────────────────────────────────────╯
                                                                                                            

Compatibility Check #3: Rust 1.60.0                                                                                                                                                                                                                                                                                   [FAIL]   Is incompatible 
                                                                                                                                                                                                                     
  ╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
  │ error: package `reedline v0.17.0 (/home/jaudiger/Development/git-repositories/jaudiger/reedline)` cannot be built because it requires rustc 1.62.1 or newer, while the currently active rustc version is 1.60.0 │
  │                                                                                                                                                                                                                 │
  ╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
                                                                                                                                                                                                                     

Compatibility Check #4: Rust 1.61.0                                                                                                                                                                                                                                                                                   [FAIL]   Is incompatible 
                                                                                                                                                                                                                     
  ╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
  │ error: package `reedline v0.17.0 (/home/jaudiger/Development/git-repositories/jaudiger/reedline)` cannot be built because it requires rustc 1.62.1 or newer, while the currently active rustc version is 1.61.0 │
  │                                                                                                                                                                                                                 │
  ╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
                                                                                                                                                                                                                     

Result:
   Considered (min … max):   Rust 1.56.0 … Rust 1.68.0 
   Search method:            bisect                    
   MSRV:                     1.62.1                    
   Target:                   x86_64-unknown-linux-gnu 

[sholderbach]

Right as we pull in nu-ansi-term that should have increased.