build(deps): bump actions/checkout from 5.0.0 to 6.0.0 in the github-actions group #1216

Job	Run time
mono_repo self validate	35s
analyze_and_format; Dart 3.7.0; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_...	4m 37s
analyze_and_format; Dart dev; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_ge...	3m 49s
unittest; Dart 3.7.0; PKG: _test_package; `dart test`	46s
unittest; Dart 3.7.0; PKG: generated/googleapis; `dart test`	3m 17s
unittest; Dart 3.7.0; PKG: discoveryapis_generator; `dart test`	51s
unittest; Dart 3.7.0; PKG: googleapis_auth; `dart test -p vm`	43s
unittest; Dart 3.7.0; PKG: googleapis_auth; `dart test -p chrome --compiler dart2js,dart2wasm`	2m 10s
unittest; Dart 3.7.0; PKG: generated/googleapis_beta; `dart test`	47s
unittest; Dart 3.7.0; PKG: discoveryapis_commons; `dart test`	44s
unittest; Dart dev; PKG: _test_package; `dart test`	39s
unittest; Dart dev; PKG: discoveryapis_generator; `dart test`	41s
unittest; Dart dev; PKG: generated/googleapis_beta; `dart test`	46s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p vm`	44s
unittest; Dart dev; PKG: generated/googleapis; `dart test`	2m 27s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p chrome --compiler dart2js,dart2wasm`	1m 36s
unittest; Dart dev; PKG: discoveryapis_commons; `dart test`	39s
	25m 51s

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