chore(version): Bump version 2.6.0 #1950

Job	Run time
test / test-dart-vm (3.3.0)	1m 26s
test / test-dart-vm (stable)	1m 22s
native_test / test-dart-native (macos-14)	1m 1s
native_test / test-dart-native (windows-latest)	1m 57s
dart2js_test / test-dart-2js (3.3.0, chrome)	3m 21s
dart2js_test / test-dart-2js (3.3.0, firefox)	3m 50s
dart2js_test / test-dart-2js (stable, chrome)	3m 33s
dart2js_test / test-dart-2js (stable, firefox)	3m 34s
ddc_test / test-dart-ddc (3.3.0, chrome)	3m 4s
ddc_test / test-dart-ddc (3.3.0, firefox)	3m 4s
ddc_test / test-dart-ddc (stable, chrome)	2m 52s
ddc_test / test-dart-ddc (stable, firefox)	2m 55s
	31m 59s

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