chore(version): Bump version 2.6.1 #2417

Job	Run time
test / test-dart-vm (3.6.0)	1m 47s
test / test-dart-vm (stable)	2m 8s
native_test / test-dart-native (macos-14)	1m 14s
dart2js_test / test-dart-2js (3.6.0, chrome)	1m 47s
dart2js_test / test-dart-2js (3.6.0, firefox)	2m 5s
dart2js_test / test-dart-2js (stable, chrome)	2m 2s
native_test / test-dart-native (windows-latest)	4m 48s
dart2js_test / test-dart-2js (stable, firefox)	1m 52s
ddc_test / test-dart-ddc (3.6.0, chrome)	1m 58s
ddc_test / test-dart-ddc (3.6.0, firefox)	2m 14s
ddc_test / test-dart-ddc (stable, chrome)	1m 56s
ddc_test / test-dart-ddc (stable, firefox)	2m 4s
	25m 55s

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