Use SHA-256 for checksums

[martincostello]

Fix BA2004 warning from Binskim.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e9c9c40) 94.06% compared to head (54da8c6) 93.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
- Coverage   94.06%   93.90%   -0.17%     
==========================================
  Files          22       22              
  Lines        1214     1214              
==========================================
- Hits         1142     1140       -2     
- Misses         72       74       +2     

Flag	Coverage Δ
linux	59.06% <ø> (-0.17%)	⬇️
macos	59.22% <ø> (ø)
windows	93.57% <ø> (ø)

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see 1 file with indirect coverage changes

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