[jdk21u] RFR: 8314656: GHA: No need for Debian ports keyring installation after JDK-8313701

[Aleksey Shipilev]

Clean backport to maintain clean undiverged GHA between releases.

Additional testing:
 - [ ] GHA

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Commit messages:
 - Backport 76b9011c9ecb8c0c713a58d034f281ba70d65d4e

Changes: https://git.openjdk.org/jdk21u/pull/118/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=118&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314656
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/118.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/118/head:pull/118

PR: https://git.openjdk.org/jdk21u/pull/118