Bump actions/stale from 8.0.0 to 9.0.0 #304

Job	Run time
mono_repo self validate	17s
analyze_and_format; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_...	37s
analyze_and_format; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_pr...	39s
analyze_and_format; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_pr...	29s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-randomiz...	1m 38s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-randomiz...	1m 1s
unit_test; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-random...	1m 47s
unit_test; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_proxy, pk...	1m 48s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_proxy, pkgs...	1m 49s
unit_test; linux; Dart dev; PKG: pkgs/shelf_router_generator; `dart test --run-skipped -t presubm...	58s
unit_test; windows; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-rand...	1m 55s
unit_test; windows; Dart 3.0.0; PKGS: pkgs/shelf_packages_handler, pkgs/shelf_static, pkgs/shelf_...	1m 16s
unit_test; windows; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-random...	1m 56s
unit_test; windows; Dart dev; PKGS: pkgs/shelf_packages_handler, pkgs/shelf_static, pkgs/shelf_te...	1m 16s
	17m 26s

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