Update to peter-evans/create-pull-request to v8 #665

Job	Run time
buildJRubyWindows (windows-2022, 9.4.15.0)	14s
build (ubuntu-22.04-arm, jruby-9.4.15.0)	7s
build (ubuntu-24.04-arm, jruby-9.4.15.0)	8s
build (ubuntu-24.04, jruby-9.4.15.0)	5s
build (ubuntu-22.04, jruby-9.4.15.0)	5s
buildJRubyWindows (windows-11-arm, 9.4.15.0)	20s
build (macos-15-intel, jruby-9.4.15.0)	8s
build (macos-14, jruby-9.4.15.0)	6s
Create PR to setup-ruby	0s
	1m 13s

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