change to new and working repo urls

[lucidd]

What does this PR change?

the old centos 7 repo urls don't work anymore. this changes the urls to the currently working ones.

GUI diff

No difference.

• DONE

Documentation

• No documentation needed
• DONE

Test coverage

• No tests

• DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/24768
Port(s): https://github.com/SUSE/spacewalk/pull/24783

• DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

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• No changelog needed

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Re-run a test

If you need to re-run a test, please mark the related checkbox, it will be unchecked automatically once it has re-run:

• Re-run test "changelog_test"
• Re-run test "backend_unittests_pgsql"
• Re-run test "java_pgsql_tests"
• Re-run test "schema_migration_test_pgsql"
• Re-run test "susemanager_unittests"
• Re-run test "javascript_lint"
• Re-run test "spacecmd_unittests"

Before you merge

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[mcalmer]

I think we need a changelog for this change. Best would be to have a bug number.
Could happen that customers wil L3 will come soon and than we can close them as "duplicates"

[mcalmer]

@lucidd please port also to 4.3