Create SECURITY.md #5703

Job	Run time
check	17s
preliminary	15s
test-sqlalchemy-v1 (3.11, macos-latest)	1m 29s
test-sqlalchemy-v1 (3.11, windows-latest)	3m 56s
test-sqlalchemy-v1 (3.11, ubuntu-latest)	2m 32s
test (3.9, macos-latest)	1m 56s
test (3.9, ubuntu-latest)	1m 55s
test (3.10, ubuntu-latest)	1m 55s
test (3.9, windows-latest)	1m 47s
test (3.10, windows-latest)	1m 48s
test (3.11, windows-latest)	1m 46s
test (3.11, macos-latest)	1m 40s
test (3.10, macos-latest)	1m 54s
test (3.11, ubuntu-latest)	1m 56s
release	0s
	25m 6s

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