chore(version): Bump version 2.6.0 #1854

Job	Run time
test / test-dart-vm (3.3.0)	1m 36s
test / test-dart-vm (stable)	1m 32s
native_test / test-dart-native (macos-14)	1m 7s
native_test / test-dart-native (windows-latest)	3m 53s
ddc_test / test-dart-ddc (3.3.0, chrome)	6m 14s
ddc_test / test-dart-ddc (3.3.0, firefox)	6m 19s
ddc_test / test-dart-ddc (stable, chrome)	6m 18s
ddc_test / test-dart-ddc (stable, firefox)	6m 26s
dart2js_test / test-dart-2js (3.3.0, chrome)	9m 22s
dart2js_test / test-dart-2js (3.3.0, firefox)	10m 25s
dart2js_test / test-dart-2js (stable, chrome)	9m 45s
dart2js_test / test-dart-2js (stable, firefox)	10m 3s
	1h 13m 0s

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