Bump dart-lang/setup-dart from 1.6.1 to 1.6.2 #1035

Job	Run time
analyzer_and_format; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_s...	45s
mono_repo self validate	16s
analyzer_and_format; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_ser...	42s
unit_test; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 29s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/an...	3m 41s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/en...	1m 2s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test -p chrome`	1m 7s
unit_test; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 4s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/anno...	3m 23s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/ensu...	52s
unit_test; Dart dev; PKG: json_serializable; `dart test -p chrome`	49s
ensure_build; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pr...	2m 8s
ensure_build; Dart dev; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pres...	1m 36s
	18m 54s

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