Bump DavidAnson/markdownlint-cli2-action from 15.0.0 to 16.0.0 #1103

Job	Run time
analyzer_and_format; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_ser...	41s
mono_repo self validate	12s
analyzer_and_format; Dart 3.4.0; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_s...	37s
unit_test; Dart 3.4.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/an...	2m 5s
unit_test; Dart 3.4.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/en...	45s
unit_test; Dart 3.4.0; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 4s
unit_test; Dart 3.4.0; PKG: json_serializable; `dart test -p chrome`	57s
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...	2m 5s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/ensu...	50s
unit_test; Dart dev; PKG: json_serializable; `dart test -p chrome`	52s
ensure_build; Dart dev; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pres...	1m 28s
ensure_build; Dart 3.4.0; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pr...	1m 37s
	14m 17s

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