build

Suppress maybe-uninitialized warning by gcc-13 #1791

Job	Run time
ruby-versions / Generate Ruby versions	5s
build (2.6 / windows-latest)	1m 36s
build (2.6 / macos-latest)	46s
build (2.7 / windows-latest)	1m 37s
build (2.7 / ubuntu-latest)	32s
build (3.0 / ubuntu-latest)	19s
build (2.6 / ubuntu-latest)	31s
build (3.1 / macos-latest)	15s
build (3.0 / macos-latest)	16s
build (3.1 / ubuntu-latest)	20s
build (3.1 / windows-latest)	1m 12s
build (2.7 / macos-latest)	34s
build (3.0 / windows-latest)	1m 7s
build (3.3 / ubuntu-latest)	18s
build (3.2 / windows-latest)	1m 5s
build (3.2 / ubuntu-latest)	24s
build (3.2 / macos-latest)	16s
build (3.4 / ubuntu-latest)	18s
build (3.4 / macos-latest)	15s
build (3.3 / macos-latest)	21s
build (mswin / windows-2022)	1m 28s
build (head / ubuntu-latest)	18s
build (truffleruby-head / macos-latest)	46s
build (mingw / windows-latest)	1m 27s
build (3.4 / windows-latest)	1m 7s
build (3.3 / windows-latest)	1m 9s
build (head / macos-latest)	22s
build (truffleruby-head / ubuntu-latest)	49s
	19m 33s

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