ci(github-action): pin dependencies

[unsc-oni-ancilla[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	pinDigest	-> 34e1148
actions/setup-python	action	pinDigest	-> a26af69
peter-evans/create-pull-request	action	pinDigest	-> c5a7806

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[!WARNING] Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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