fixup! Refactor code and fix a couple of missing DTLSv1.3 checks. #262

Job	Run time
basic_clang	3m 38s
check_docs	47s
check_update	1m 36s
check-ansi	2m 30s
minimal	1m 5s
address_ub_sanitizer	3m 16s
basic_gcc	3m 25s
enable_non-default_options	2m 59s
full_featured	3m 36s
fuzz_tests	2m 35s
legacy	4m 47s
memory_sanitizer	4m 28s
no-deprecated	3m 8s
no-legacy	3m 8s
non-caching	3m 19s
no-shared-macos (macos-13)	7m 43s
no-shared-ubuntu	5m 16s
out-of-readonly-source-and-install-macos (macos-13)	11m 46s
no-shared-macos (macos-14)	5m 2s
out-of-readonly-source-and-install-macos (macos-14)	7m 57s
out-of-readonly-source-and-install-ubuntu	3m 15s
self-hosted	0s
threads_sanitizer	3m 16s
external-test-cf-quiche	2m 45s
external-test-pyca (1.51.0, 3.9)	2m 20s
external-tests	2m 36s
	1h 36m 13s

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