fix: update Dockerfile (iptables-libs RPM path)

[moggaa]

What this PR does / why we need it:
This PR updates the Dockerfile to use the archived iptables-libs RPM , which resolves the build failure caused by the missing RPM package.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #713

Special notes for your reviewer:
This PR updates the RPM file path to /vault/rocky/9.4/devel. If there are any issues with this path (for example, if a different version of Rocky is preferred), I will fix it.

Checklist:

• Fixes #
• PR messages has document related information
• Labelled this PR & related issue with breaking-changes tag
• PR messages has breaking changes related information
• Labelled this PR & related issue with requires-upgrade tag
• PR messages has upgrade related information
• Commit has unit tests
• Commit has integration tests
• E2E run Required for the changes