chore(version): Bump version 2.6.0 #2339

Job	Run time
test / test-dart-vm (3.3.0)	2m 23s
test / test-dart-vm (stable)	2m 15s
dart2js_test / test-dart-2js (3.3.0, chrome)	3m 0s
ddc_test / test-dart-ddc (3.3.0, chrome)	3m 7s
dart2js_test / test-dart-2js (3.3.0, firefox)	3m 1s
ddc_test / test-dart-ddc (3.3.0, firefox)	3m 25s
dart2js_test / test-dart-2js (stable, chrome)	3m 6s
ddc_test / test-dart-ddc (stable, chrome)	2m 55s
dart2js_test / test-dart-2js (stable, firefox)	2m 43s
ddc_test / test-dart-ddc (stable, firefox)	3m 3s
native_test / test-dart-native (macos-14)	2m 0s
native_test / test-dart-native (windows-latest)	3m 56s
	34m 54s

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