Bump dart-lang/setup-dart from 1.6.0 to 1.6.2 (#405) #316

Job	Run time
analyze_and_format; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_pr...	36s
analyze_and_format; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_pr...	32s
mono_repo self validate	20s
analyze_and_format; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_...	44s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-randomiz...	46s
unit_test; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-random...	1m 52s
unit_test; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_proxy, pk...	1m 46s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-randomiz...	1m 13s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_proxy, pkgs...	1m 21s
unit_test; linux; Dart dev; PKG: pkgs/shelf_router_generator; `dart test --run-skipped -t presubm...	51s
unit_test; windows; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-rand...	2m 23s
unit_test; windows; Dart 3.0.0; PKGS: pkgs/shelf_packages_handler, pkgs/shelf_static, pkgs/shelf_...	1m 33s
unit_test; windows; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-random...	1m 45s
unit_test; windows; Dart dev; PKGS: pkgs/shelf_packages_handler, pkgs/shelf_static, pkgs/shelf_te...	1m 8s
	16m 50s

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