chore(version): Bump version 2.6.0 #2303

Job	Run time
test / test-dart-vm (3.3.0)	1m 39s
test / test-dart-vm (stable)	1m 38s
ddc_test / test-dart-ddc (3.3.0, chrome)	10m 16s
ddc_test / test-dart-ddc (3.3.0, firefox)	10m 37s
native_test / test-dart-native (macos-14)	1m 18s
ddc_test / test-dart-ddc (stable, chrome)	10m 40s
dart2js_test / test-dart-2js (3.3.0, chrome)	17m 15s
ddc_test / test-dart-ddc (stable, firefox)	10m 58s
dart2js_test / test-dart-2js (3.3.0, firefox)	18m 13s
native_test / test-dart-native (windows-latest)	2m 13s
dart2js_test / test-dart-2js (stable, chrome)	18m 2s
dart2js_test / test-dart-2js (stable, firefox)	19m 13s
	2h 2m 2s

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