Pin Github actions to SHAs

[jistr]

Additionally, update the basic checkout and setup-python actions to non-EOL releases.

Assisted-by: goose+gemini

[holser]

/lgtm

[openshift-ci]

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[jistr]

/cherry-pick 18.0-fr6

[openshift-cherrypick-robot]

@jistr: new pull request created: #1456

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In response to this:

/cherry-pick 18.0-fr6

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[jistr]

/cherry-pick 18-stable

[openshift-cherrypick-robot]

@jistr: new pull request could not be created: failed to create pull request against #18-stable from head openshift-cherrypick-robot:cherry-pick-1448-to-18-stable: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"No commits between openstack-k8s-operators:18-stable and openshift-cherrypick-robot:cherry-pick-1448-to-18-stable"}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request","status":"422"}

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In response to this:

/cherry-pick 18-stable

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[jistr]

Ah this one made it before 18-stable cut, so no need to backport there.