Update Scala to 3.4.0 #8438

Job	Run time
jvm-tests-2	3m 57s
generate-linux-launcher	3m 58s
jvm-tests-1	3m 58s
generate-windows-launcher	3m 57s
generate-macos-launcher	4m 1s
jvm-tests-3	3m 58s
unit-tests	3m 58s
bloop-memory-footprint	3m 57s
checks	3m 57s
docs-tests	3m 59s
format	16s
generate-linux-arm64-native-launcher	0s
generate-macos-m1-launcher	0s
generate-mostly-static-launcher	3m 57s
generate-static-launcher	3m 58s
reference-doc	1m 49s
test-hypothetical-sbt-export	20s
vc-redist	0s
native-macos-m1-tests	0s
native-mostly-static-tests-2	1s
native-mostly-static-tests-3	1s
native-mostly-static-tests-1	1s
native-static-tests-1	1s
native-static-tests-2	1s
native-static-tests-3	1s
native-linux-tests-2	1s
native-linux-tests-1	1s
native-linux-tests-3	1s
publish	1s
native-windows-tests-3	1s
native-windows-tests-1	1s
native-windows-tests-2	1s
native-macos-tests-2	1s
native-macos-tests-3	1s
native-macos-tests-1	1s
launchers	1s
Update Windows packages	1s
Update packages	1s
	50m 19s

Provide feedback