Add Emacs 29.4 to the CI matrix #335

Job	Run time
build (24.4, false)	27s
build (24.5, false)	27s
build (25.1, false)	29s
build (25.2, false)	24s
build (25.3, false)	27s
build (26.1, false)	26s
build (26.2, false)	25s
build (26.3, false)	25s
build (27.1, false)	24s
build (27.2, false)	25s
build (28.1, false)	25s
build (28.2, false)	24s
build (29.1, false)	26s
build (29.2, false)	32s
build (29.3, false)	32s
build (29.4, false)	31s
build (release-snapshot, false)	28s
build (snapshot, true)	23s
	8m 0s

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