Pin flytekit to 1.15.0 to unblock functional tests

[eapolinario]

Tracking issue

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What changes were proposed in this pull request?

How was this patch tested?

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• added: For new features.
• changed: For changes in existing functionality.
• deprecated: For soon-to-be-removed features.
• removed: For features being removed.
• fixed: For any bug fixed.
• security: In case of vulnerabilities

This is important to improve the readability of release notes.

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• I updated the documentation accordingly.
• All new and existing tests passed.
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[flyte-bot]

Code Review Agent Run Status

• Limitations and other issues: ❌ Failure - The AI Code Review Agent skipped reviewing this change because it is configured to exclude certain pull requests based on the source/target branch or the pull request status. You can change the settings here, or contact the agent instance creator at [email protected].

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.48%. Comparing base (be6f36c) to head (22b1891).
Report is 69 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6330      +/-   ##
==========================================
- Coverage   58.49%   58.48%   -0.01%     
==========================================
  Files         937      937              
  Lines       71091    71091              
==========================================
- Hits        41585    41580       -5     
- Misses      26354    26359       +5     
  Partials     3152     3152              

Flag	Coverage Δ
unittests-datacatalog	59.06% <ø> (ø)
unittests-flyteadmin	56.27% <ø> (-0.03%)	⬇️
unittests-flytecopilot	30.99% <ø> (ø)
unittests-flytectl	64.70% <ø> (ø)
unittests-flyteidl	76.12% <ø> (ø)
unittests-flyteplugins	61.00% <ø> (ø)
unittests-flytepropeller	54.80% <ø> (ø)
unittests-flytestdlib	64.04% <ø> (+0.01%)	⬆️

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