chore(version): Bump version 2.6.0 #2282

Job	Run time
test / test-dart-vm (3.3.0)	1m 59s
test / test-dart-vm (stable)	1m 53s
native_test / test-dart-native (macos-14)	1m 10s
native_test / test-dart-native (windows-latest)	3m 40s
dart2js_test / test-dart-2js (3.3.0, chrome)	17m 21s
dart2js_test / test-dart-2js (3.3.0, firefox)	17m 23s
dart2js_test / test-dart-2js (stable, chrome)	17m 59s
dart2js_test / test-dart-2js (stable, firefox)	18m 41s
ddc_test / test-dart-ddc (3.3.0, chrome)	10m 23s
ddc_test / test-dart-ddc (3.3.0, firefox)	10m 30s
ddc_test / test-dart-ddc (stable, chrome)	10m 55s
ddc_test / test-dart-ddc (stable, firefox)	11m 18s
	2h 3m 12s

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