Unable to run Bumblebench perf tests on jdk17

[andrew-m-leonard]

Ref: #39 (comment)

https://ci.adoptium.net/job/Grinder/17197/

11:41:12      [javac] Compiling 11 source files to /home/jenkins/workspace/Grinder/aqa-tests/perf/bumbleBench/bumblebench
11:41:12      [javac] error: invalid target release: 21
11:41:12      [javac] Usage: javac <options> <source files>
11:41:12      [javac] use --help for a list of possible options

Adoptium runs these perf tests on jdk8,11,17

[andrew-m-leonard]

@Spencer-Comin fyi

[smlambert]

I've reverted the change for now.