Bump pyyaml from 4.2b1 to 5.4 in /Tools/WinMLDashboard/public

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 4.2b1 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](https://github.com/yaml/pyyaml/commits/5.4)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Tools/WinMLDashboard/public/requirements.txt

@@ -9,7 +9,7 @@ Keras-Applications==1.0.6
 Keras-Preprocessing==1.0.5
 keras2onnx==1.7.0
 protobuf==3.17.3
-PyYAML==4.2b1
+PyYAML==5.4
 scipy==1.1.0
 scikit-learn==0.20.1
 skl2onnx==1.7.0