[jdk21u-dev] RFR: 8323170: j2dbench is using outdated javac source/target to be able to build by itself

[Jiří Vaněk]

8323170: j2dbench is using outdated  javac source/target to be able to build by itself

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Commit messages:
 - Backport b5df2f43147535b4d22c6451e3a65170159f76b7

Changes: https://git.openjdk.org/jdk21u-dev/pull/278/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=278&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323170
  Stats: 49 lines in 3 files changed: 43 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/278.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/278/head:pull/278

PR: https://git.openjdk.org/jdk21u-dev/pull/278