bump version to `1.3.0dev0` #191

Job	Run time
build_linux (3.9)	2m 58s
build_linux (3.12)	2m 47s
build_windows (3.10)	9m 46s
build_windows (3.9)	6m 49s
build_windows (3.12)	5m 58s
build_linux (3.10)	2m 47s
build_linux (3.11)	2m 56s
build_windows (3.11)	7m 45s
test_linux (3.10, 1.26*, false, ubuntu-latest)	1m 32s
test_linux (3.11, 1.26*, false, ubuntu-latest)	1m 48s
test_linux (3.9, 1.26*, false, ubuntu-latest)	1m 26s
test_linux (3.12, 1.26*, false, ubuntu-latest)	1m 25s
test_windows (3.9, 1.26*, false, windows-latest)	2m 17s
test_windows (3.11, 1.26*, false, windows-latest)	2m 45s
test_windows (3.10, 1.26*, false, windows-latest)	2m 28s
test_windows (3.12, 1.26*, false, windows-latest)	2m 48s
	58m 15s

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