ci: replace actions-rs GHA

[gruebel]

Changes

• equivalent to Replace unmaintained actions-rs/toolchain action. opentelemetry-rust#1655

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 55.4%. Comparing base (1635500) to head (4db67b7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #207   +/-   ##
=====================================
  Coverage   55.4%   55.4%           
=====================================
  Files         48      48           
  Lines       6787    6787           
=====================================
  Hits        3762    3762           
  Misses      3025    3025           

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