Bump actions/checkout from 3.6.0 to 4.1.2 (#927) #1342

Job	Run time
format_analyze; linux; Dart 2.19.0; PKG: protobuf; `dart analyze lib`, `dart analyze test`	22s
format_analyze; linux; Dart dev; PKG: protobuf; `dart format --output=none --set-exit-if-changed ...	19s
format_analyze; linux; Dart dev; PKG: benchmarks; `dart format --output=none --set-exit-if-change...	24s
format_analyze; linux; Dart dev; PKG: api_benchmark; `dart format --output=none --set-exit-if-cha...	32s
mono_repo self validate	14s
format_analyze; linux; Dart dev; PKG: protoc_plugin; `dart format --output=none --set-exit-if-cha...	35s
run_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	44s
run_tests; linux; Dart dev; PKG: protobuf; `dart test`	22s
run_tests; linux; Dart 2.19.0; PKG: protobuf; `dart test`	30s
run_tests; linux; Dart dev; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	39s
run_tests; osx; Dart 2.19.0; PKG: protobuf; `dart test`	1m 1s
run_tests; osx; Dart dev; PKG: protobuf; `dart test`	42s
run_tests; windows; Dart 2.19.0; PKG: protobuf; `dart test`	39s
run_tests; windows; Dart dev; PKG: protobuf; `dart test`	45s
run_legacy_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `d...	33s
	8m 21s

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