ci: replace actions-rs/cargo GHA

[gruebel]

Changes

• leftover of Replace unmaintained actions-rs/toolchain action. #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 80.9%. Comparing base (1ecd1a8) to head (c880cbf).
Report is 3 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2846   +/-   ##
=====================================
  Coverage   80.9%   80.9%           
=====================================
  Files        124     124           
  Lines      23726   23726           
=====================================
+ Hits       19200   19201    +1     
+ Misses      4526    4525    -1     

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