iptables: Add runtime dependency for alternatives.

[Sumynwa]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

---

Summary

Add runtime dependency on alternatives.

Change Log

• Update Requires in spec file

Does this affect the toolchain?

NO

Associated issues

• https://microsoft.visualstudio.com/OS/_workitems/edit/54604746

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-YYYY-XXXX

Test Methodology

• Pipeline build id: Buddy Build

[mfrw]

Related PR:

• Revert "iptables: Enable nftables (#10786)" #10814

[eric-desrochers]

Look like this is fixing the regression for which we revert the commit via PR #10814

In addition to this fix, should you also re-introduce this commit that no longer exist (since it was reverted) ?
882622d

[eric-desrochers]

Also please ensure to document this PR using the following tmpl for the stable maintainer group to review: https://github.com/microsoft/azurelinux/blob/3.0/.github/pull_request_template.md

[Sumynwa]

Created #11027 to reintroduce nftables changes.