build(deps): bump dart-lang/setup-dart from 1.4.0 to 1.5.0 #860

Job	Run time
analyze_and_format; Dart 3.0.0; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_...	4m 4s
mono_repo self validate	37s
analyze_and_format; Dart dev; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_ge...	4m 44s
unittest; Dart 3.0.0; PKG: discoveryapis_commons; `dart test`	55s
unittest; Dart 3.0.0; PKG: discoveryapis_generator; `dart test`	45s
unittest; Dart 3.0.0; PKG: generated/googleapis; `dart test`	6m 17s
unittest; Dart 3.0.0; PKG: _test_package; `dart test`	46s
unittest; Dart 3.0.0; PKG: generated/googleapis_beta; `dart test`	1m 4s
unittest; Dart 3.0.0; PKG: googleapis_auth; `dart test -p chrome`	4m 43s
unittest; Dart 3.0.0; PKG: googleapis_auth; `dart test -p vm`	59s
unittest; Dart dev; PKG: _test_package; `dart test`	41s
unittest; Dart dev; PKG: discoveryapis_commons; `dart test`	54s
unittest; Dart dev; PKG: discoveryapis_generator; `dart test`	56s
unittest; Dart dev; PKG: generated/googleapis; `dart test`	3m 54s
unittest; Dart dev; PKG: generated/googleapis_beta; `dart test`	1m 11s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p chrome`	3m 24s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p vm`	46s
	36m 40s

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