Update egress policy for jobs using Codecov

[ericcornelissen]

Relates to #1489

Summary

Allow api.codecov.io:443 for test job. Should address the warning currently emitted by the Codecov action:

Test
Codecov: Failed to properly create commit: The process '/home/runner/work/_actions/codecov/codecov-action/c16abc29c95fcf9174b58eb7e1abf4c866893bc8/dist/codecov' failed with exit code 1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7c186ca) to head (a356cd7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #1494      +/-   ##
===========================================
+ Coverage   99.75%   100.00%   +0.24%     
===========================================
  Files          17        17              
  Lines        1627      1627              
===========================================
+ Hits         1623      1627       +4     
+ Misses          4         0       -4     

Flag	Coverage Δ
breakage	85.55% <ø> (?)
compatibility	85.18% <ø> (?)
e2e-Ubuntu	91.01% <ø> (?)
integration-MacOS	99.59% <ø> (ø)
integration-Ubuntu	99.59% <ø> (?)
integration-Windows	99.43% <ø> (ø)
unit	100.00% <ø> (?)

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see 2 files with indirect coverage changes