Changelog:
==========
Bump GitHub Actions versions and fix warnings in the process
Bump versions of used GitHub Actions
Add support for 3.12, drop EOL 3.7
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit 2cbfb7f1ff04135b74ba948ab16193a0aa380f92)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
