ci: check that LLVM branch corresponds to semver before releasing

[antonbaliasnikov]

What ❔

Check LLVM.lock branch corresponds to semver before releasing.

Why ❔

To make sure LLVM version is pinned to LLVM backend release instead of main.

Checklist

• PR title corresponds to the body of PR.
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via cargo fmt and checked with cargo clippy.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.12%. Comparing base (9c8fd92) to head (b0289a2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #124       +/-   ##
=========================================
+ Coverage      0   64.12%   +64.12%     
=========================================
  Files         0       54       +54     
  Lines         0     4365     +4365     
=========================================
+ Hits          0     2799     +2799     
- Misses        0     1566     +1566     

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