ci: Checkout repo first in the Release Version Labeler workflow

[nuno-faria]

Which issue does this PR close?

• N/A.

Rationale for this change

Follow up to #25776. Adds the missing checkout to the release version workflow.

What changes are included in this PR?

• Added the missing checkout.
• Fix the script fmt.

What is the testing strategy for this PR?

N/A.

Are there any user-facing changes?

No.

[alamb]

Thanks @nuno-faria and @martin-g

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.55%. Comparing base (8bb2758) to head (548fef0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25845      +/-   ##
==========================================
- Coverage   82.55%   82.55%   -0.01%     
==========================================
  Files        1141     1141              
  Lines      440365   440365              
  Branches   440365   440365              
==========================================
- Hits       363543   363536       -7     
- Misses      54830    54835       +5     
- Partials    21992    21994       +2     

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[nuno-faria]

It works!