chore(version): Bump version 2.6.0 #1421

Job	Run time
test / test-dart-vm (3.3.0)	1m 47s
test / test-dart-vm (stable)	1m 24s
ddc_test / test-dart-ddc (3.3.0, chrome)	5m 6s
ddc_test / test-dart-ddc (3.3.0, firefox)	5m 0s
ddc_test / test-dart-ddc (stable, chrome)	4m 58s
ddc_test / test-dart-ddc (stable, firefox)	5m 15s
dart2js_test / test-dart-2js (3.3.0, chrome)	7m 10s
dart2js_test / test-dart-2js (3.3.0, firefox)	7m 30s
native_test / test-dart-native (macos-14)	1m 8s
dart2js_test / test-dart-2js (stable, chrome)	6m 46s
native_test / test-dart-native (windows-latest)	3m 31s
dart2js_test / test-dart-2js (stable, firefox)	7m 24s
	56m 59s

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