ci: upgrade to using macos-13 #1547

Job	Run time
config	8s
win+VS build	0s
linux32 (daald/ubuntu32:xenial)	4m 4s
linux-musl (alpine)	4m 4s
pedantic (fedora)	4m 4s
documentation	4m 18s
linux-asan-ubsan (ubuntu-latest)	4m 17s
linux-gcc (ubuntu-20.04)	4m 18s
linux-gcc-default (ubuntu-latest)	4m 15s
linux-leaks (ubuntu-latest)	4m 16s
win+VS test	0s
linux-sha256 (ubuntu-latest)	4m 15s
osx-clang (macos-13)	4m 20s
linux-TEST-vars (ubuntu-20.04)	4m 16s
osx-gcc (macos-13)	4m 31s
sparse	2m 56s
static-analysis	4m 16s
win build	4m 10s
win test	0s
	1h 2m 28s

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