chore: Use SHA-256 utility

[FrederikBolding]

Use sha256 utility for checksumming. The utility matches the existing implementation and was upstreamed to utils.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​metamask/​utils@​11.8.1 ⏵ 11.9.0	+1		+1	+6

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (075eda3) to head (b544b23).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3781      +/-   ##
==========================================
- Coverage   98.33%   98.33%   -0.01%     
==========================================
  Files         420      420              
  Lines       12032    12025       -7     
  Branches     1874     1870       -4     
==========================================
- Hits        11832    11825       -7     
  Misses        200      200              

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