Bump dart_bridge_version to 1.4.0 #84

Job	Run time
Read build matrix from manifest	4s
Build Python 3.12.13 / Build Python for iOS and macOS	30s
Build Python 3.12.13 / Build Python for Windows	24s
Build Python 3.12.13 / Build Python for Linux	17s
Build Python 3.12.13 / Build Python for Android	23s
Build Python 3.13.14 / Build Python for Android	29s
Build Python 3.14.6 / Build Python for Android	30s
Build Python 3.14.6 / Build Python for iOS and macOS	30s
Build Python 3.14.6 / Build Python for Windows	18s
Build Python 3.13.14 / Build Python for Windows	28s
Build Python 3.13.14 / Build Python for iOS and macOS	29s
Build Python 3.13.14 / Build Python for Linux	17s
Build Python 3.14.6 / Build Python for Linux	23s
Publish Release Assets	1s
	5m 3s

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