Fix git checkout step in release workflow

[t1m0thyj]

What It Does

How to Test

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (647ed1b) 83.54% compared to head (886a4cc) 83.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #235   +/-   ##
=======================================
  Coverage   83.54%   83.54%           
=======================================
  Files          34       34           
  Lines        2084     2084           
=======================================
  Hits         1741     1741           
  Misses        343      343           

Flag	Coverage Δ
unittests	83.54% <ø> (ø)

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[github-actions]

Release failed for the main branch. 😢

Error: The process '/usr/bin/git' failed with exit code 1
    at ExecState._setResult (/home/runner/work/_actions/zowe-actions/octorelease/v1/dist/git.js:974:21)
    at ExecState.CheckComplete (/home/runner/work/_actions/zowe-actions/octorelease/v1/dist/git.js:960:16)
    at ChildProcess.<anonymous> (/home/runner/work/_actions/zowe-actions/octorelease/v1/dist/git.js:863:21)
    at ChildProcess.emit (node:events:513:28)
    at maybeClose (node:internal/child_process:1100:16)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:304:5)

Check the workflow run for more error details.

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