chore(version): Bump version 2.6.0 #1951

Job	Run time
test / test-dart-vm (3.3.0)	1m 28s
test / test-dart-vm (stable)	1m 30s
ddc_test / test-dart-ddc (3.3.0, chrome)	2m 52s
ddc_test / test-dart-ddc (3.3.0, firefox)	3m 10s
ddc_test / test-dart-ddc (stable, chrome)	2m 41s
native_test / test-dart-native (macos-14)	1m 22s
ddc_test / test-dart-ddc (stable, firefox)	3m 8s
dart2js_test / test-dart-2js (3.3.0, chrome)	3m 49s
native_test / test-dart-native (windows-latest)	2m 51s
dart2js_test / test-dart-2js (3.3.0, firefox)	3m 31s
dart2js_test / test-dart-2js (stable, chrome)	3m 23s
dart2js_test / test-dart-2js (stable, firefox)	3m 50s
	33m 35s

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