Use sha256 digests instead of sha1 when building rpm

[Amndeep7]

Resolves #3179

Change the macro to use SHA256 instead of SHA1 when creating the binary file digests.

Description

This enables one to install the rpm on FIPS enabled boxes.

Related Issue

#3179
https://gitlab.com/cinc-project/distribution/workstation/-/issues/31
https://chefcommunity.slack.com/archives/CHLTJ6XP0/p1738365505368259

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• If Gemfile.lock has changed, I have used --conservative to do it and included the full output in the Description above.
• All new and existing tests passed.
• All commits have been signed-off for the Developer Certificate of Origin.

[netlify]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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