Bump OSX from 12 to 13 #283

Job	Run time
Default release build / Build documentation for all repos	3m 18s
Default release build / Build release for linux on ubuntu-20.04	9m 39s
Default release build / Build release for osx on macos-13	5m 52s
Default release build / Build release for windows on windows-2019	13m 4s
Default release build / Build release for freebsd on ubuntu-latest	5m 38s
Validate outputs of build_release_template.yml	1s
Validate results of build_release_template.yml (windows-latest, windows, dmd.master.windows.7z)	45s
Validate results of build_release_template.yml (macos-latest, osx, dmd.master.osx.tar.xz)	1m 21s
Validate results of build_release_template.yml (ubuntu-latest, linux, dmd.master.linux.tar.xz)	8s
Validate results of build_release_template.yml (ubuntu-latest, freebsd, dmd.master.freebsd-64.tar...	35s
	40m 21s

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