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 (we generate changelog entries from PRs).
• 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.

[antonbaliasnikov]

To be tested and merged after #196

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.64%. Comparing base (6a3fa05) to head (33a5909).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
=======================================
  Coverage   69.64%   69.64%           
=======================================
  Files         130      130           
  Lines       15403    15403           
=======================================
  Hits        10727    10727           
  Misses       4676     4676           

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