chore(version): Bump version 2.6.0 #2900

Job	Run time
test / test-dart-vm (3.3.0)	2m 2s
test / test-dart-vm (stable)	1m 57s
dart2js_test / test-dart-2js (3.3.0, chrome)	4m 48s
native_test / test-dart-native (macos-14)	1m 55s
dart2js_test / test-dart-2js (3.3.0, firefox)	4m 57s
ddc_test / test-dart-ddc (3.3.0, chrome)	3m 44s
native_test / test-dart-native (windows-latest)	2m 6s
dart2js_test / test-dart-2js (stable, chrome)	4m 34s
ddc_test / test-dart-ddc (3.3.0, firefox)	4m 2s
dart2js_test / test-dart-2js (stable, firefox)	4m 33s
ddc_test / test-dart-ddc (stable, chrome)	3m 27s
ddc_test / test-dart-ddc (stable, firefox)	3m 29s
	41m 34s

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