chore: leverage fallback resolver for MSRV check

[gruebel]

Changes

Rust 1.84 introduced a new resolver type which is MSRV aware

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.9%. Comparing base (c48871a) to head (1f91ac3).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #263   +/-   ##
=====================================
  Coverage   50.9%   50.9%           
=====================================
  Files         64      64           
  Lines       8506    8506           
=====================================
  Hits        4331    4331           
  Misses      4175    4175           

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[hdost]

We have typically tried to reserve bumping of dependencies for when it's necessary by our dependencies. By changing the msrv check this negates that.

[gruebel]

We have typically tried to reserve bumping of dependencies for when it's necessary by our dependencies. By changing the msrv check this negates that.

not sure I follow, but there is no dependency upgrade or something like that. Rust 1.84 added a new resolver, which is MSRV aware so it chooses automatically the latest version, which fits the given MSRV. This means you don't need to maintain a separate patch mechanism for making sure you don't update to a version with a higher MSRV need. Here it is nicely explained https://doc.rust-lang.org/cargo/reference/resolver.html#rust-version

The MSRV check still works the same and this is proof it works as intended otherwise it would have failed with complaining about the dependencies needing a higher MSRV.