Restrict trigger push branch for GitHub Workflow #600

Job	Run time
build / lint-toml	7s
build / lint-python	8s
build / generate-license	48s
build / lint-rust	24s
build / check-crates-patch	-1s
build / Linux arm64 (3.14t)	9m 22s
build / Linux x86_64 (3.14t)	11m 26s
build / macOS arm64 (abi3)	12m 13s
build / Linux arm64 (abi3)	9m 5s
build / Windows x86_64 (abi3)	12m 58s
build / Windows x86_64 (3.14t)	11m 50s
build / macOS arm64 (3.14t)	8m 25s
build / Linux x86_64 (abi3)	12m 46s
build / Source distribution	-1s
build / macOS x86_64 (${{ matrix.python-tag }})	-1s
build / Build docs	1m 21s
build / Merge build artifacts	-1s
test / test-matrix (3.13, abi3, false)	4m 14s
test / test-matrix (3.11, abi3, false)	3m 53s
test / test-matrix (3.10, abi3, false)	4m 0s
test / test-matrix (3.14, abi3, false)	3m 52s
test / test-matrix (3.12, abi3, false)	3m 52s
test / test-matrix (3.14t, 3.14t, true)	3m 23s
	1h 54m 3s

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