Improve cache warnings (#4517) #7121

Job	Run time
Check SPDX identifiers	5s
Code health check	1m 18s
pyca/cryptography test	26s
CodeQL analysis	1m 26s
Build doc	1m 27s
Type hints check	27s
ubuntu-latest 3.7 non_root -K scanner	1m 24s
ubuntu-latest 3.8 non_root -K scanner	1m 25s
ubuntu-latest 3.9 non_root -K scanner	1m 25s
ubuntu-latest 3.10 non_root -K scanner	1m 26s
ubuntu-latest 3.11 non_root -K scanner	1m 26s
ubuntu-latest 3.12 non_root -K scanner	1m 29s
ubuntu-latest 3.12 root -K scanner	1m 26s
ubuntu-latest pypy3.9 root -K scanner	45s
ubuntu-latest libpcap 3.12 root -K scanner	1m 26s
macos-14 3.12 both -K scanner	1m 28s
ubuntu-latest 3.12 root -k scanner	1m 26s
ubuntu-latest pypy3.9 root -k scanner	1m 15s
macos-14 3.12 both -k scanner	1m 15s
	22m 45s

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