chore(ci): return to nightly builds

[mgrachev]

Description

Rust nightly build was fixed:

• Failed to compile ring under nightly Rust (1.61.0, 9f4dc0b4d 2022-03-23) briansmith/ring#1469
• Failed to compile ring under nightly Rust (1.61.0, 9f4dc0b4d 2022-03-23) rust-lang/rust#95267
• Ignore doc comments in a declarative macro matcher. rust-lang/rust#95390

Motivation and Context

How Has This Been Tested?

Screenshots / Output (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #73 (a1b977c) into main (cddb4d4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   38.60%   38.60%           
=======================================
  Files          13       13           
  Lines         868      868           
  Branches      227      229    +2     
=======================================
  Hits          335      335           
  Misses        425      425           
  Partials      108      108           

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[orhun]

Nice, thanks!