Bump dart_bridge_version to 1.3.1 #78

Job	Run time
Read build matrix from manifest	7s
Build Python 3.14.6 / Build Python for Android	4m 56s
Build Python 3.14.6 / Build Python for iOS and macOS	4m 55s
Build Python 3.13.14 / Build Python for Linux	21s
Build Python 3.14.6 / Build Python for Linux	27s
Build Python 3.12.13 / Build Python for Windows	4m 19s
Build Python 3.14.6 / Build Python for Windows	4m 41s
Build Python 3.12.13 / Build Python for Android	4m 49s
Build Python 3.13.14 / Build Python for iOS and macOS	4m 57s
Build Python 3.12.13 / Build Python for Linux	19s
Build Python 3.13.14 / Build Python for Android	4m 48s
Build Python 3.13.14 / Build Python for Windows	4m 28s
Build Python 3.12.13 / Build Python for iOS and macOS	4m 42s
Publish Release Assets	1s
	43m 50s

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