chore(version): Bump version 2.6.0 #1417

Job	Run time
test / test-dart-vm (3.3.0)	3m 45s
test / test-dart-vm (stable)	3m 47s
dart2js_test / test-dart-2js (3.3.0, chrome)	7m 9s
dart2js_test / test-dart-2js (3.3.0, firefox)	7m 28s
ddc_test / test-dart-ddc (3.3.0, chrome)	4m 47s
dart2js_test / test-dart-2js (stable, chrome)	7m 38s
ddc_test / test-dart-ddc (3.3.0, firefox)	5m 10s
native_test / test-dart-native (macos-14)	1m 7s
dart2js_test / test-dart-2js (stable, firefox)	7m 34s
ddc_test / test-dart-ddc (stable, chrome)	4m 49s
native_test / test-dart-native (windows-latest)	3m 27s
ddc_test / test-dart-ddc (stable, firefox)	5m 9s
	1h 1m 50s

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