Un-hide get_max_udp_payload_size #5241

Job	Run time
test on solaris	6m 12s
test on freebsd	3m 59s
audit	21s
features (ubuntu-latest)	1h 22m 29s
lint	1m 9s
msrv	1m 9s
features (macos-latest)	26m 51s
features (windows-latest)	50m 5s
test (ubuntu-latest, stable)	1m 37s
test-android (x86_64-linux-android, x86_64, 26)	2m 58s
test (ubuntu-latest, beta)	1m 18s
test-aws-lc-rs	2m 8s
test-android (x86_64-linux-android, x86_64, 25)	2m 50s
test (macos-latest, stable)	1m 9s
test on illumos	6m 34s
test-android (i686-linux-android, x86, 26)	2m 53s
test (windows-latest, stable)	3m 54s
test-android (i686-linux-android, x86, 25)	2m 42s
test on netbsd	5m 9s
test wasm32-unknown-unknown	50s
	3h 26m 17s

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