Upgrade cloudevents to v2.15.2

[ddl-ebrown]

Tracking issue

https://github.com/flyteorg/flyte/issues/

Why are the changes needed?

• Resolves medium CVE-2024-28110

What changes were proposed in this pull request?

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.10%. Comparing base (8bb5b8c) to head (7a4f5c1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5142   +/-   ##
=======================================
  Coverage   59.09%   59.10%           
=======================================
  Files         645      645           
  Lines       55540    55540           
=======================================
+ Hits        32824    32825    +1     
+ Misses      20127    20126    -1     
  Partials     2589     2589           

Flag	Coverage Δ
unittests	59.10% <ø> (+<0.01%)	⬆️

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[eapolinario]

Thank you.