chore(version): Bump version 2.6.0 #2283

Job	Run time
test / test-dart-vm (3.3.0)	1m 41s
test / test-dart-vm (stable)	1m 43s
dart2js_test / test-dart-2js (3.3.0, chrome)	11m 21s
dart2js_test / test-dart-2js (3.3.0, firefox)	11m 21s
ddc_test / test-dart-ddc (3.3.0, chrome)	10m 15s
dart2js_test / test-dart-2js (stable, chrome)	11m 20s
ddc_test / test-dart-ddc (3.3.0, firefox)	10m 40s
native_test / test-dart-native (macos-14)	1m 13s
dart2js_test / test-dart-2js (stable, firefox)	11m 20s
ddc_test / test-dart-ddc (stable, chrome)	10m 49s
native_test / test-dart-native (windows-latest)	3m 10s
ddc_test / test-dart-ddc (stable, firefox)	11m 19s
	1h 36m 12s

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