[jdk21u-dev] RFR: 8363965: GHA: Switch cross-compiling sysroots to Debian bookworm

[Aleksey Shipilev]

Fixes GHA cross-compilation jobs.

Additional testing:
 - [ ] GHA

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Commit messages:
 - Backport 3fe0d29ec3b5b327d633726677ba1809eec27665

Changes: https://git.openjdk.org/jdk21u-dev/pull/2019/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2019&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8363965
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2019.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2019/head:pull/2019

PR: https://git.openjdk.org/jdk21u-dev/pull/2019