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* .github/workflows/test.yml: Add Emacs 29.3. #13

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Job	Run time
build (24.3)	29s
build (24.4)	21s
build (24.5)	26s
build (25.1)	21s
build (25.2)	19s
build (25.3)	20s
build (26.1)	25s
build (26.2)	20s
build (26.3)	19s
build (27.1)	21s
build (27.2)	26s
build (28.1)	20s
build (28.2)	25s
build (29.1)	22s
build (29.2)	27s
build (29.3)	26s
build (release-snapshot)	32s
build (snapshot)	20s
	6m 59s