ci: Bump FreeBSD in CI to v13.3 #750

Job	Run time
windows_gnu (nightly, x86_64-pc-windows-gnu)	1m 28s
test (ubuntu-latest, nightly)	40s
clippy	17s
test (ubuntu-latest, beta)	38s
cross (ubuntu-latest)	1m 28s
fmt	7s
test (ubuntu-latest, stable)	35s
cross (macos-latest)	1m 7s
test (windows-latest, nightly)	1m 26s
msrv (ubuntu-latest)	1m 9s
test (windows-latest, beta)	1m 20s
msrv (windows-latest)	1m 5s
test (windows-latest, stable)	2m 18s
test (macos-latest, nightly)	45s
security_audit	9s
test (macos-latest, beta)	42s
test (macos-latest, stable)	41s
	15m 55s

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