[jdk21u-dev] RFR: 8360539: DTLS handshakes fails due to improper cookie validation logic

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle

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Commit messages:
 - Backport a471fe992fc0d71ba65b5fdbcc44b97a2783b90a

Changes: https://git.openjdk.org/jdk21u-dev/pull/2563/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2563&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360539
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2563.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2563/head:pull/2563

PR: https://git.openjdk.org/jdk21u-dev/pull/2563