Bump actions/configure-pages from 2 to 4 (#5589) #4926

Job	Run time
testinstall - - ubuntu-latest	5m 3s
teststandard - - ubuntu-latest	31m 30s
testmanuals - - ubuntu-latest	5m 47s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 30s
testpackages testinstall-loadall - - ubuntu-latest	20m 12s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	5m 24s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	29m 23s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	6m 58s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	5m 46s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	21m 59s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 17s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	3m 25s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug --disable-Werror" - ubuntu-20.04	4m 24s
testmockpkg testinstall - - windows-2019	14m 58s
Send Slack notification on status change	8s
	2h 45m 44s

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