gtk.cfg: g_application_get_default is transfer none (#8545) #19748

Job	Run time
build_cmake (alpine:3.23, false, false)	4m 24s
build_make (ubuntu:24.04)	2m 47s
build_cmake (ubuntu:24.04, true, true)	2m 20s
build_make (alpine:3.23)	5m 49s
build_cmake (ubuntu:25.10, true, true)	5m 22s
build_make (ubuntu:25.10)	3m 30s
	24m 12s

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