RFR: 8342984: Bump minimum boot jdk to JDK 24

[Mikael Vidstedt]

With the JDK 24 GA out it's time to bump the minimum boot JDK version for mainline/JDK 25.

Testing: tier1-5, GHA

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Commit messages:
 - Update copyright year
 - 8342984: Bump minimum boot jdk to JDK 24

Changes: https://git.openjdk.org/jdk/pull/24305/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24305&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342984
  Stats: 14 lines in 3 files changed: 0 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/24305.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24305/head:pull/24305

PR: https://git.openjdk.org/jdk/pull/24305