chore(version): Bump version 2.6.0 #2286

Job	Run time
test / test-dart-vm (3.3.0)	1m 46s
test / test-dart-vm (stable)	1m 34s
native_test / test-dart-native (macos-14)	1m 13s
native_test / test-dart-native (windows-latest)	3m 57s
dart2js_test / test-dart-2js (3.3.0, chrome)	16m 48s
dart2js_test / test-dart-2js (3.3.0, firefox)	17m 10s
ddc_test / test-dart-ddc (3.3.0, chrome)	9m 37s
dart2js_test / test-dart-2js (stable, chrome)	16m 54s
ddc_test / test-dart-ddc (3.3.0, firefox)	10m 8s
dart2js_test / test-dart-2js (stable, firefox)	17m 28s
ddc_test / test-dart-ddc (stable, chrome)	10m 44s
ddc_test / test-dart-ddc (stable, firefox)	10m 13s
	1h 57m 32s

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