[release-1.13] Bump CloudEvents GO-SDK to 2.15.2

[matzew]

Proposed Changes

• GO-SDK bump for Golang, same as Bump CloudEvents GO-SDK to 2.15.2 #7747 - but for 1.13

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Using 2.15.2 of Go-sdk for CloudEvents

Docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.38%. Comparing base (b5528fc) to head (c3ffc39).

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.13    #7748      +/-   ##
================================================
- Coverage         69.40%   69.38%   -0.02%     
================================================
  Files               336      336              
  Lines             19162    19162              
================================================
- Hits              13299    13296       -3     
- Misses             5207     5209       +2     
- Partials            656      657       +1     

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[creydr]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, matzew

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[matzew]

/cherry-pick release-1.12

[knative-prow-robot]

@matzew: once the present PR merges, I will cherry-pick it on top of release-1.12 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[knative-prow-robot]

@matzew: #7748 failed to apply on top of branch "release-1.12":

Applying: dizzy: Bump to latest of GO SDK for CE
Using index info to reconstruct a base tree...
M	go.mod
Falling back to patching base and 3-way merge...
Auto-merging go.mod
CONFLICT (content): Merge conflict in go.mod
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 dizzy: Bump to latest of GO SDK for CE
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.