Prepare for 3.0.16 #408

Job	Run time
basic_clang	1s
basic_gcc	1s
address_ub_sanitizer	1s
buildtest	1s
check_docs	1s
check_update	1s
check-ansi	1s
enable_non-default_options	1s
external-test-pyca (1.51.0, 3.9)	1s
external-tests	1s
fips_and_ktls	1s
legacy	1s
memory_sanitizer	1s
no-deprecated	1s
minimal	1s
no-legacy	1s
non-caching	1s
no-shared-macos (macos-13)	4m 46s
no-shared-ubuntu	1s
no-shared-macos (macos-14)	2m 49s
out-of-readonly-source-and-install-macos (macos-13)	10m 49s
out-of-readonly-source-and-install-macos (macos-14)	4m 52s
out-of-readonly-source-and-install-ubuntu	1s
self-hosted	0s
threads_sanitizer	1s
	23m 36s

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