CI: Update clang-format action to v0.18.2 #3674

Job	Run time
cmake-offline-googletest-src	4m 38s
ubuntu-latest [CC gcc; botan; shared libs on; GnuPG stable]	4m 4s
cmake-offline-googletest	4m 10s
ubuntu-latest [CC clang; botan; shared libs on; GnuPG stable]	4m 26s
system-sexpp, sexpp shared libs on, rnp shared libs on	3m 13s
ubuntu-latest [CC gcc; openssl; shared libs on; GnuPG stable]	4m 29s
package-source	42s
system-sexpp, sexpp shared libs on, rnp shared libs off	2m 49s
ubuntu-latest [CC clang; openssl; shared libs on; GnuPG stable]	4m 5s
system-sexpp, sexpp shared libs off, rnp shared libs on	3m 41s
ubuntu-20.04 [CC gcc; openssl; shared libs on; GnuPG stable]	3m 48s
system-sexpp, sexpp shared libs off, rnp shared libs off	2m 57s
ubuntu-latest [CC gcc; botan; shared libs off; GnuPG stable]	4m 16s
package	1m 11s
debian-tests	28s
	48m 57s

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