chore(version): Bump version 2.6.0 #4598

Job	Run time
test / test-dart-vm (3.3.0)	3m 56s
test / test-dart-vm (stable)	3m 46s
ddc_test / test-dart-ddc (3.3.0, chrome)	10m 7s
native_test / test-dart-native (macos-14)	2m 59s
dart2js_test / test-dart-2js (3.3.0, chrome)	14m 50s
ddc_test / test-dart-ddc (3.3.0, firefox)	10m 41s
native_test / test-dart-native (windows-latest)	6m 6s
dart2js_test / test-dart-2js (3.3.0, firefox)	14m 59s
ddc_test / test-dart-ddc (stable, chrome)	10m 5s
ddc_test / test-dart-ddc (stable, firefox)	10m 39s
dart2js_test / test-dart-2js (stable, chrome)	14m 48s
dart2js_test / test-dart-2js (stable, firefox)	15m 12s
	1h 58m 8s

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