chore(workflows): Use ubuntu-latest #2139

Job	Run time
test / test-dart-vm (3.0.1)	5m 32s
test / test-dart-vm (stable)	4m 9s
ddc_test / test-dart-ddc (3.0.1, chrome)	6m 47s
ddc_test / test-dart-ddc (3.0.1, firefox)	6m 19s
ddc_test / test-dart-ddc (stable, chrome)	6m 9s
ddc_test / test-dart-ddc (stable, firefox)	6m 0s
native_test / test-dart-native (macos-latest)	4m 45s
dart2js_test / test-dart-2js (3.0.1, chrome)	7m 6s
native_test / test-dart-native (windows-latest)	11m 12s
dart2js_test / test-dart-2js (3.0.1, firefox)	7m 41s
dart2js_test / test-dart-2js (stable, chrome)	7m 9s
dart2js_test / test-dart-2js (stable, firefox)	7m 21s
	1h 20m 10s

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