Bump pyyaml from 5.3.1 to 5.4

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3.1 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.3.1...5.4)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -3,7 +3,7 @@ docker==2.6.1
 h5py==2.10.0
 matplotlib==2.1.0
 numpy==1.16.0
-pyyaml==5.1
+pyyaml==5.4
 psutil==5.6.6
 scipy==1.0.0
 scikit-learn==0.19.1

requirements_py38.txt

@@ -3,7 +3,7 @@ docker==2.6.1
 h5py==2.10.0
 matplotlib==3.3.4
 numpy==1.19.5
-pyyaml==5.3.1
+pyyaml==5.4
 psutil==5.8.0
 scipy==1.5.4
 scikit-learn