Remove dev dependency with failure

[tatref]

Hi,

Today, CI does not pass because of object release 0.30, that requires a recent compiler.

├── failure v0.1.8
│   ├── backtrace v0.3.67
│   │   ├── object v0.30.0

Here are the release notes (gimli-rs/object@ed03e05):

• The minimum supported rust version for the read feature has changed to 1.52.0.
• The minimum supported rust version for the write feature has changed to 1.61.0.

Also, failure is deprecated since 2020, they recommend to use anyhow or thiserror

failure is only used to test the functions signatures when they return Result for composition

How could we improve the situation?

[eminence]

It's getting increasingly hard to maintain the 1.48 MSRV in procfs. I've just opened #222 to try to fix this particular issue. I've also opened #223 to track the topic of MSRV for procfs

[eminence]

I'm going to close this, since our CI is now only testing against stable/beta/nightly.