Use explicit timeout for the workflow #52

Job	Run time
build_docs	39s
no_features (ubuntu, 1.77)	57s
with_features (ubuntu, 1.77, serde)	23s
no_features (ubuntu, stable)	58s
no_features (ubuntu, beta)	59s
with_features (ubuntu, stable, serde)	25s
no_features (ubuntu, nightly)	51s
with_features (ubuntu, beta, serde)	26s
no_features (macos, 1.77)	51s
with_features (ubuntu, nightly, serde)	1m 5s
no_features (macos, stable)	45s
no_features (macos, beta)	50s
with_features (macos, 1.77, serde)	28s
no_features (macos, nightly)	1m 2s
with_features (macos, stable, serde)	16s
no_features (windows, 1.77)	1m 54s
with_features (macos, beta, serde)	28s
with_features (macos, nightly, serde)	25s
no_features (windows, stable)	2m 28s
no_features (windows, beta)	1m 52s
with_features (windows, 1.77, serde)	50s
no_features (windows, nightly)	1m 46s
with_features (windows, stable, serde)	36s
with_features (windows, beta, serde)	52s
	22m 6s

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