chore(version): Bump version 2.6.0 #2301

Job	Run time
test / test-dart-vm (3.3.0)	1m 28s
test / test-dart-vm (stable)	1m 25s
native_test / test-dart-native (macos-14)	1m 9s
native_test / test-dart-native (windows-latest)	3m 38s
dart2js_test / test-dart-2js (3.3.0, chrome)	7m 56s
ddc_test / test-dart-ddc (3.3.0, chrome)	4m 2s
dart2js_test / test-dart-2js (3.3.0, firefox)	5m 44s
ddc_test / test-dart-ddc (3.3.0, firefox)	4m 29s
dart2js_test / test-dart-2js (stable, chrome)	6m 2s
ddc_test / test-dart-ddc (stable, chrome)	4m 10s
dart2js_test / test-dart-2js (stable, firefox)	6m 9s
ddc_test / test-dart-ddc (stable, firefox)	4m 30s
	50m 42s

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