Bump actions/checkout from 3.6.0 to 4.0.0 (#1421) #1123

Job	Run time
setup-muzzle-matrix	2m 34s
smoke-test (windows-2019, glassfish)	29m 51s
smoke-test (windows-2019, jboss)	14m 11s
smoke-test (windows-2019, jetty)	33m 20s
smoke-test (windows-2019, liberty)	37m 7s
smoke-test (windows-2019, tomcat)	28m 45s
smoke-test (windows-2019, tomee)	27m 41s
smoke-test (windows-2019, weblogic)	15m 29s
smoke-test (windows-2019, wildfly)	34m 36s
smoke-test (windows-2019, other)	14m 42s
smoke-test (ubuntu-20.04, glassfish)	11m 31s
smoke-test (ubuntu-20.04, jboss)	11m 47s
smoke-test (ubuntu-20.04, jetty)	12m 17s
smoke-test (ubuntu-20.04, liberty)	17m 25s
smoke-test (ubuntu-20.04, profiler)	13m 17s
smoke-test (ubuntu-20.04, tomcat)	11m 37s
smoke-test (ubuntu-20.04, tomee)	12m 34s
smoke-test (ubuntu-20.04, weblogic)	15m 25s
smoke-test (ubuntu-20.04, websphere)	12m 21s
smoke-test (ubuntu-20.04, wildfly)	15m 38s
smoke-test (ubuntu-20.04, other)	9m 42s
build	6m 1s
shellcheck	3s
muzzle (:instrumentation:c3p0)	3m 23s
muzzle (:instrumentation:commons-dbcp2)	3m 0s
muzzle (:instrumentation:hikaricp)	3m 28s
muzzle (:instrumentation:jetty)	3m 7s
muzzle (:instrumentation:khttp-0.1)	3m 32s
muzzle (:instrumentation:liberty)	3m 16s
muzzle (:instrumentation:micrometer-1.3)	3m 25s
muzzle (:instrumentation:micrometer-1.5)	2m 47s
muzzle (:instrumentation:oracle-ucp)	2m 57s
muzzle (:instrumentation:tomcat)	3m 38s
muzzle (:instrumentation:tomcat-jdbc)	2m 56s
muzzle (:instrumentation:vibur-dbcp)	3m 19s
muzzle (:instrumentation:weblogic)	3m 16s
muzzle (:instrumentation:websphere)	2m 44s
muzzle (:instrumentation:wildfly)	2m 52s
	7h 15m 34s

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