Update prune_stale_issues.yml

[iBrandyJackson]

Update prune_stale_issues.yml to match latest action/stale version available.

Description

Updates the version number of the gha workflow file of actions/stale to the latest to fix the GitHub action prune stale issues job that is currently failing.

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

...

References

Community Note

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[hashicorp-cla]

All committers have signed the CLA.

[github-actions]

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