ci: Use reusable workflows for fmt and security_audit & fix CI failure #599

Job	Run time
clippy	16s
msrv (1.36)	43s
wasi	41s
test (ubuntu-latest, nightly)	1m 1s
test (ubuntu-latest, beta)	41s
test (ubuntu-latest, stable)	42s
test (windows-latest, nightly)	54s
test (windows-latest, beta)	35s
test (windows-latest, stable)	1m 36s
test (macos-latest, nightly)	50s
fmt / fmt	11s
test (macos-latest, beta)	23s
test (macos-latest, stable)	18s
security_audit / security_audit	2m 47s
	11m 38s

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