chore(version): Bump version 2.6.0 #2269

Job	Run time
test / test-dart-vm (3.3.0)	1m 36s
test / test-dart-vm (stable)	1m 33s
dart2js_test / test-dart-2js (3.3.0, chrome)	1m 59s
dart2js_test / test-dart-2js (3.3.0, firefox)	2m 7s
dart2js_test / test-dart-2js (stable, chrome)	1m 49s
dart2js_test / test-dart-2js (stable, firefox)	2m 1s
ddc_test / test-dart-ddc (3.3.0, chrome)	1m 58s
ddc_test / test-dart-ddc (3.3.0, firefox)	2m 20s
native_test / test-dart-native (macos-14)	1m 0s
ddc_test / test-dart-ddc (stable, chrome)	1m 50s
native_test / test-dart-native (windows-latest)	2m 21s
ddc_test / test-dart-ddc (stable, firefox)	2m 4s
	22m 38s

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