Fix broken link for CONTRIBUTING.md

[bhimrazy]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes broken link for CONTRIBUTING.md in PR template

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

Did you have fun?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78%. Comparing base (a9cf751) to head (d909f8f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #404   +/-   ##
===================================
  Coverage    78%    78%           
===================================
  Files        34     34           
  Lines      5045   5045           
===================================
  Hits       3954   3954           
  Misses     1091   1091