ci: bump everything to use 3.4 final #1097

Job	Run time
jruby-head	54s
html5lib-tests	19s
ruby-head (ubuntu, enable)	22s
ruby-head-valgrind (disable)	1m 27s
ruby-head (ubuntu, disable)	23s
truffleruby-head (--disable-system-libraries --disable-static)	1m 39s
ruby-head (windows, enable)	14s
truffleruby-head (--disable-system-libraries --enable-static)	1m 26s
ruby-head (windows, disable)	53s
xmlsoft-head (ubuntu)	24s
truffleruby-head (--enable-system-libraries)	1m 39s
xmlsoft-head (windows)	14s
ruby-head (macos, enable)	37s
ruby-head (macos, disable)	1m 7s
xmlsoft-head (macos)	1m 0s
xmlsoft-head-valgrind	14s
	12m 52s

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