Add src/third_party/dart/third_party/yaml_edit to DEPS (#28830)
Add src/third_party/dart/third_party/yaml_edit to DEPS (#28830)

The HHH builder run into a build failure after [0] landed, which has
added the package:yaml_edit dependency to dart's DEPS.

This PR adds the same dependency to flutter engine DEPS, which should
unbreak the HHH build.

[0] https://github.com/dart-lang/sdk/commit/f7fd4ebcec8e624f5c5116a70ad9b57141a76707
rmacnak-google/engine,rmacnak-google/engine,chinmaygarde/flutter_engine,aam/engine,jason-simmons/flutter_engine,devoncarew/engine,flutter/engine,flutter/engine,flutter/engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,flutter/engine,flutter/engine,chinmaygarde/flutter_engine,devoncarew/engine,chinmaygarde/flutter_engine,flutter/engine,aam/engine,aam/engine,devoncarew/engine,chinmaygarde/flutter_engine,flutter/engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,rmacnak-google/engine,devoncarew/engine,chinmaygarde/flutter_engine,aam/engine,jason-simmons/flutter_engine,rmacnak-google/engine,aam/engine,aam/engine,rmacnak-google/engine,chinmaygarde/flutter_engine,devoncarew/engine,rmacnak-google/engine,rmacnak-google/engine,jason-simmons/flutter_engine,flutter/engine,jason-simmons/flutter_engine,aam/engine,devoncarew/engine,devoncarew/engine,chinmaygarde/flutter_engine,aam/engine