[github-actions] Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	pinDigest	→ de0fac2
actions/setup-python	action	pinDigest	→ a309ff8
codecov/codecov-action	action	pinDigest	→ 57e3a13

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Configuration

📅 Schedule: (in timezone America/New_York)

• Branch creation
  • Between 12:00 AM and 03:59 AM, on day 1 of the month (* 0-3 1 * *)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

👻 Immortal: This PR will be recreated if closed unmerged. Get config help if that's undesired.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.31%. Comparing base (af65c21) to head (55bdbb2).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #41   +/-   ##
=======================================
  Coverage   99.31%   99.31%           
=======================================
  Files           6        6           
  Lines         583      583           
  Branches      117      117           
=======================================
  Hits          579      579           
  Misses          3        3           
  Partials        1        1           

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