Remove macos-12, Add macos-15 runner #48

Job	Run time
test	4s
test-single-plugin	4s
test-multiple-plugins-with-commas	4s
test-single-plugin-with-version	6s
test-login	7s
test-version-output	4s
test-login-with-region-and-group	5s
test-login-failure	5s
test-multiple-plugins-with-newlines	4s
test-multiple-plugins-with-spaces	5s
test-multiple-plugins-with-versions	5s
test-multiple-plugins-with-comma-space	4s
test-multiple-plugins-with-versions-and-newlines	5s
check-dist	8s
test-login-manual	6s
test-multiple-platforms (ubuntu-latest)	8s
test-multiple-platforms (ubuntu-24.04)	7s
test-multiple-platforms (ubuntu-22.04)	10s
test-multiple-platforms (ubuntu-20.04)	9s
test-multiple-platforms (macos-latest)	14s
test-multiple-platforms (macos-15)	16s
test-multiple-platforms (macos-14)	14s
test-multiple-platforms (macos-13)	17s
test-multiple-platforms (windows-latest)	35s
test-multiple-platforms (windows-2022)	31s
test-multiple-platforms (windows-2019)	27s
	4m 24s

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