json_annotation: prepare to release v4.9.0 #1077

Job	Run time
analyzer_and_format; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_ser...	38s
mono_repo self validate	17s
analyzer_and_format; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_s...	35s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test -p chrome`	1m 1s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/an...	3m 40s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/en...	1m 0s
unit_test; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 1s
unit_test; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 31s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/anno...	3m 21s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/ensu...	58s
unit_test; Dart dev; PKG: json_serializable; `dart test -p chrome`	53s
ensure_build; Dart dev; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pres...	0s
ensure_build; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pr...	0s
	14m 55s

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