fix: add checkout step to dependabot auto-merge workflow

[MitaliBhalla]

• Add missing checkout action to fix 'fatal: not a git repository' error
• This ensures gh CLI commands have access to the git repository
• Fixes dependabot auto-merge workflow failures

/label tide/merge-method-squash

[openshift-ci]

@MitaliBhalla: all tests passed!

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.91%. Comparing base (e2612c3) to head (6b68b44).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #857   +/-   ##
=======================================
  Coverage   52.91%   52.91%           
=======================================
  Files          86       86           
  Lines        6524     6524           
=======================================
  Hits         3452     3452           
  Misses       2610     2610           
  Partials      462      462           

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[feichashao]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feichashao, MitaliBhalla

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