chore(workflows): Use ubuntu-latest #1518

Job	Run time
test / test-dart-vm (3.0.1)	2m 12s
test / test-dart-vm (3.0.1)	2m 12s
test / test-dart-vm (stable)	1m 59s
test / test-dart-vm (stable)	1m 59s
ddc_test / test-dart-ddc (3.0.1, chrome)	11m 17s
ddc_test / test-dart-ddc (3.0.1, chrome)	11m 17s
native_test / test-dart-native (macos-latest)	2m 32s
native_test / test-dart-native (macos-latest)	2m 32s
dart2js_test / test-dart-2js (3.0.1, chrome)	20m 7s
dart2js_test / test-dart-2js (3.0.1, chrome)	20m 7s
ddc_test / test-dart-ddc (3.0.1, firefox)	11m 56s
ddc_test / test-dart-ddc (3.0.1, firefox)	11m 56s
native_test / test-dart-native (windows-latest)	4m 23s
native_test / test-dart-native (windows-latest)	4m 23s
dart2js_test / test-dart-2js (3.0.1, firefox)	18m 48s
dart2js_test / test-dart-2js (3.0.1, firefox)	18m 48s
ddc_test / test-dart-ddc (stable, chrome)	9m 51s
ddc_test / test-dart-ddc (stable, chrome)	9m 51s
ddc_test / test-dart-ddc (stable, firefox)	10m 20s
ddc_test / test-dart-ddc (stable, firefox)	10m 20s
dart2js_test / test-dart-2js (stable, chrome)	17m 2s
dart2js_test / test-dart-2js (stable, chrome)	16m 24s
dart2js_test / test-dart-2js (stable, firefox)	17m 11s
dart2js_test / test-dart-2js (stable, firefox)	17m 11s
	4h 14m 38s

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