Use a maintained action for "changed files"

[vdemeester]

Changes

This is an alternative to #7360.

Closes #7360.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
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Release Notes

NONE

[vdemeester]

/kind misc

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerop

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[vdemeester]

/hold

[vdemeester]

/hold cancel

[afrittoli]

/lgtm

[JeromeJu]

/cherry-pick release-v0.53.x
We would also need this for the cherry-pick PR to work on v0.53 to pass the 'woke' tests now.

[tekton-robot]

@JeromeJu: #7364 failed to apply on top of branch "release-v0.53.x":

Applying: Use a maintained action for "changed files"
.git/rebase-apply/patch:23: trailing whitespace.
        
warning: 1 line adds whitespace errors.
Using index info to reconstruct a base tree...
M	pkg/reconciler/taskrun/resources/taskref_test.go
M	pkg/reconciler/taskrun/taskrun_test.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/reconciler/taskrun/taskrun_test.go
Auto-merging pkg/reconciler/taskrun/resources/taskref_test.go
CONFLICT (content): Merge conflict in pkg/reconciler/taskrun/resources/taskref_test.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Use a maintained action for "changed files"
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-v0.53.x
We would also need this for the cherry-pick PR to work on v0.53 to pass the 'woke' tests now.

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