[jdk21u-dev] RFR: 8331113: createJMHBundle.sh support configurable maven repo mirror

[SendaoYan]

Hi,
  Clean backport of JDK-8331113 for createJMHBundle.sh support configurable maven repo mirror.
  Only change devkit shell script, no risk.

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Commit messages:
 - Backport ce9eac38191fa700afa3ac06b2b202576a11dd71

Changes: https://git.openjdk.org/jdk21u-dev/pull/533/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=533&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331113
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/533.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/533/head:pull/533

PR: https://git.openjdk.org/jdk21u-dev/pull/533