[release-20.0] Fix week number for date_format evalengine function (#17432)

[dbussink]

Backport #17432 to fix CI

Related Issue(s)

Fix from #17432

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

[vitess-bot]

Review Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.41%. Comparing base (722cbbd) to head (077b072).
Report is 2 commits behind head on release-20.0.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-20.0   #17453   +/-   ##
=============================================
  Coverage         66.40%   66.41%           
=============================================
  Files              1541     1541           
  Lines            244092   244088    -4     
=============================================
+ Hits             162098   162102    +4     
+ Misses            81994    81986    -8     

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