Update GitHub Actions workflows to use actions/checkout@v5, codecov/codecov-action@v5, and add static.yml.

[terabytesoftw]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.31%. Comparing base (005d9f2) to head (4ed4fee).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #20500      +/-   ##
============================================
- Coverage     64.48%   63.31%   -1.18%     
  Complexity    11576    11576              
============================================
  Files           433      433              
  Lines         37610    37609       -1     
============================================
- Hits          24252    23811     -441     
- Misses        13358    13798     +440     

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