Update actions/checkout version in extension workflow templates #12392
Description
Describe the feature or problem you'd like to solve
The extension workflow templates use an outdated version of actions/checkout.
pkg/cmd/extension/ext_tmpls/goBinWorkflow.ymlpkg/cmd/extension/ext_tmpls/otherBinWorkflow.yml
Proposed solution
Update actions/checkout to the latest version.
https://github.com/actions/checkout/releases/tag/v6
Additional context
Related: #9394