Bump dart-lang/setup-dart from 1.6.5 to 1.7.0 in the github-actions group #400

Job	Run time
mono_repo self validate	19s
analysis; Dart stable; PKGS: command_line, enhanced_enums, extension_methods, ffi/hello_world, ff...	47s
analysis; Dart dev; PKGS: command_line, enhanced_enums, extension_methods, ffi/hello_world, ffi/p...	39s
analysis; Dart stable; PKGS: command_line, enhanced_enums, extension_methods, ffi/hello_world, ff...	36s
analysis; Dart dev; PKGS: command_line, enhanced_enums, extension_methods, ffi/hello_world, ffi/p...	47s
unit_test; Dart dev; PKG: command_line; `dart test`	30s
unit_test; Dart dev; PKG: enhanced_enums; `dart test`	22s
unit_test; Dart dev; PKG: extension_methods; `dart test`	22s
unit_test; Dart dev; PKG: ffi/primitives; `dart test`	24s
unit_test; Dart dev; PKG: ffi/hello_world; `dart test`	25s
unit_test; Dart dev; PKG: ffi/structs; `dart test`	26s
unit_test; Dart dev; PKG: server/simple; `dart test`	31s
unit_test; Dart dev; PKG: package_constraint_solver; `dart pub global run coverage:test_with_cove...	29s
unit_test; Dart stable; PKG: command_line; `dart test`	28s
unit_test; Dart stable; PKG: enhanced_enums; `dart test`	22s
unit_test; Dart stable; PKG: extension_methods; `dart test`	25s
unit_test; Dart stable; PKG: ffi/hello_world; `dart test`	26s
unit_test; Dart stable; PKG: ffi/primitives; `dart test`	26s
unit_test; Dart stable; PKG: ffi/structs; `dart test`	26s
unit_test; Dart stable; PKG: server/simple; `dart test`	25s
Mark Coveralls job finished	3s
	9m 38s

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