bump version to 4.6.18 #1967

Job	Run time
supported_jdks (core, 17)	2m 22s
latest_jdk (ubuntu-latest, core)	1m 57s
supported_jdks (core, 18)	1m 57s
latest_jdk (ubuntu-latest, consumer -x :consumer:junit:clojureTest)	3m 15s
supported_jdks (consumer, 17)	3m 55s
latest_jdk (ubuntu-latest, provider)	3m 32s
supported_jdks (consumer, 18)	3m 16s
latest_jdk (ubuntu-latest, pact-specification-test)	4m 7s
supported_jdks (provider, 17)	4m 11s
latest_jdk (windows-latest, core)	3m 8s
supported_jdks (provider, 18)	3m 30s
latest_jdk (windows-latest, consumer -x :consumer:junit:clojureTest)	4m 23s
supported_jdks (pact-specification-test, 17)	1m 37s
latest_jdk (windows-latest, provider)	4m 58s
supported_jdks (pact-specification-test, 18)	1m 38s
latest_jdk (windows-latest, pact-specification-test)	5m 0s
latest_jdk (macos-latest, core)	3m 56s
latest_jdk (macos-latest, consumer -x :consumer:junit:clojureTest)	3m 54s
latest_jdk (macos-latest, provider)	3m 52s
latest_jdk (macos-latest, pact-specification-test)	1m 48s
	1h 6m 16s

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