chore(version): Bump version 2.6.0 #2342

Job	Run time
test / test-dart-vm (3.3.0)	2m 35s
test / test-dart-vm (stable)	2m 15s
dart2js_test / test-dart-2js (3.3.0, chrome)	2m 51s
dart2js_test / test-dart-2js (3.3.0, firefox)	2m 49s
dart2js_test / test-dart-2js (stable, chrome)	2m 41s
ddc_test / test-dart-ddc (3.3.0, chrome)	2m 54s
dart2js_test / test-dart-2js (stable, firefox)	2m 49s
native_test / test-dart-native (macos-14)	1m 39s
ddc_test / test-dart-ddc (3.3.0, firefox)	3m 15s
native_test / test-dart-native (windows-latest)	3m 30s
ddc_test / test-dart-ddc (stable, chrome)	4m 38s
ddc_test / test-dart-ddc (stable, firefox)	2m 54s
	34m 50s

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