Bump actions/stale from 9.0.0 to 9.1.0 in the github-actions group (#… #708

Job	Run time
mono_repo self validate	13s
analyze_format; linux; Dart 3.6.0; PKG: source_gen; `dart analyze`	25s
analyze_format; linux; Dart dev; PKGS: _test_annotations, example, example_usage, source_gen; `da...	31s
unit_test; linux; Dart 3.6.0; PKG: source_gen; `dart test`	1m 5s
unit_test; linux; Dart dev; PKG: example_usage; `dart test --run-skipped`	46s
unit_test; linux; Dart 3.6.0; PKG: example_usage; `dart test --run-skipped`	41s
unit_test; windows; Dart 3.6.0; PKG: source_gen; `dart test`	1m 17s
unit_test; linux; Dart dev; PKG: source_gen; `dart test`	1m 8s
unit_test; windows; Dart dev; PKG: source_gen; `dart test`	1m 31s
	7m 37s

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