Bump actions/checkout to v4 #4275

Job	Run time
Ansible 2.16 lint with Python 3.12	1m 27s
Check changed files	4s
Tox pep8 with Python 3.10	18s
Ansible 2.15 lint with Python 3.10	1m 27s
Tox releasenotes with Python 3.10	26s
Tox docs with Python 3.10	21s
Build Kayobe Image / Build kayobe image	4m 6s
aio (Ubuntu Jammy OVN) / All in one	49m 59s
aio (Rocky 9 OVS) / All in one	51m 11s
aio (Ubuntu Jammy OVS) / All in one	47m 25s
aio upgrade (Rocky 9 OVN) / All in one	1h 40m 43s
aio (Rocky 9 OVN) / All in one	53m 16s
Check container image tags / Check container image tags	0s
aio upgrade (Ubuntu Jammy OVS) / All in one	1h 36m 15s
	6h 46m 58s

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