Restore sndrcv behaviour from before 53afe84 #7181

Job	Run time
CodeQL analysis	3m 11s
pyca/cryptography test	27s
Build doc	5m 54s
Code health check	1m 7s
Type hints check	28s
Check SPDX identifiers	4s
ubuntu-latest 3.7 non_root -K scanner	3m 45s
ubuntu-latest 3.8 non_root -K scanner	3m 50s
ubuntu-latest 3.9 non_root -K scanner	4m 30s
ubuntu-latest 3.10 non_root -K scanner	3m 54s
ubuntu-latest 3.11 non_root -K scanner	3m 28s
ubuntu-latest 3.12 non_root -K scanner	4m 8s
ubuntu-latest 3.12 root -K scanner	5m 9s
ubuntu-latest pypy3.9 root -K scanner	4m 6s
ubuntu-latest libpcap 3.12 root -K scanner	5m 1s
macos-14 3.12 both -K scanner	13m 7s
ubuntu-latest 3.12 root -k scanner	20m 14s
ubuntu-latest pypy3.9 root -k scanner	17m 57s
macos-14 3.12 both -k scanner	20m 15s
	2h 0m 35s

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