chore(version): Bump version 2.6.0 #1849

Job	Run time
test / test-dart-vm (3.3.0)	1m 37s
test / test-dart-vm (stable)	1m 28s
dart2js_test / test-dart-2js (3.3.0, chrome)	9m 39s
dart2js_test / test-dart-2js (3.3.0, firefox)	9m 54s
dart2js_test / test-dart-2js (stable, chrome)	9m 41s
ddc_test / test-dart-ddc (3.3.0, chrome)	5m 52s
dart2js_test / test-dart-2js (stable, firefox)	10m 25s
native_test / test-dart-native (macos-14)	1m 30s
ddc_test / test-dart-ddc (3.3.0, firefox)	6m 12s
native_test / test-dart-native (windows-latest)	2m 28s
ddc_test / test-dart-ddc (stable, chrome)	6m 21s
ddc_test / test-dart-ddc (stable, firefox)	6m 41s
	1h 11m 48s

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