RFR: 8314656: GHA: No need for Debian ports keyring installation after JDK-8313701 [v3]

[Aleksey Shipilev]

> There is no need for keyring installation after [JDK-8313701](https://bugs.openjdk.org/browse/JDK-8313701). We can simplify that part to reduce the difference between different JDK releases.
> 
> Additional testing:
>  - [ ] GHA

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into JDK-8314656-gha-nokeyring
 - Fix

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15362/files
  - new: https://git.openjdk.org/jdk/pull/15362/files/f364f61e..e41d8eb9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15362&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15362&range=01-02

  Stats: 269 lines in 44 files changed: 94 ins; 142 del; 33 mod
  Patch: https://git.openjdk.org/jdk/pull/15362.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15362/head:pull/15362

PR: https://git.openjdk.org/jdk/pull/15362