chore: Update CI to run with JDK 21 #1893

Job	Run time
supported_jdks (core, 17)	2m 59s
latest_jdk (ubuntu-latest, core)	2m 34s
supported_jdks (core, 18)	2m 45s
latest_jdk (ubuntu-latest, consumer -x :consumer:junit:clojureTest)	3m 59s
supported_jdks (core, 19)	2m 34s
latest_jdk (ubuntu-latest, provider)	5m 10s
supported_jdks (consumer, 17)	4m 11s
latest_jdk (ubuntu-latest, pact-specification-test)	1m 51s
supported_jdks (consumer, 18)	3m 52s
latest_jdk (windows-latest, core)	5m 24s
supported_jdks (consumer, 19)	3m 56s
latest_jdk (windows-latest, consumer -x :consumer:junit:clojureTest)	5m 55s
supported_jdks (provider, 17)	4m 42s
latest_jdk (windows-latest, provider)	7m 57s
latest_jdk (windows-latest, pact-specification-test)	4m 8s
supported_jdks (provider, 18)	4m 24s
latest_jdk (macos-latest, core)	1m 49s
supported_jdks (provider, 19)	4m 3s
latest_jdk (macos-latest, consumer -x :consumer:junit:clojureTest)	3m 38s
supported_jdks (pact-specification-test, 17)	1m 51s
latest_jdk (macos-latest, provider)	3m 20s
supported_jdks (pact-specification-test, 18)	1m 39s
latest_jdk (macos-latest, pact-specification-test)	1m 27s
supported_jdks (pact-specification-test, 19)	1m 39s
	1h 25m 47s

Provide feedback