[lilliput-jdk21u:lilliput] RFR: 8321134: [Lilliput/JDK21] Fix repo permissions

[Roman Kennke]

The Lilliput/JDK21u repo has the wrong permissons: it inherits permissions from jdk-updates, but should use permission from she Shenandoah project instead.

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Commit messages:
 - 8321134: [Lilliput/JDK21] Fix repo permissions

Changes: https://git.openjdk.org/lilliput-jdk21u/pull/16/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk21u&pr=16&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321134
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/lilliput-jdk21u/pull/16.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk21u.git pull/16/head:pull/16

PR: https://git.openjdk.org/lilliput-jdk21u/pull/16