Bump pyyaml from 5.1.2 to 5.4

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.1.2 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.1.2...5.4)

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

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

Author: dependabot[bot]

requirements.txt

@@ -8,7 +8,7 @@ opencv-python==4.1.0.25
 Pillow==8.2.0
 pybullet==2.6.5
 python-pcl
-PyYAML==5.1.2
+PyYAML==5.4
 scikit-learn==0.20.4
 scipy==1.2.2
 six==1.11.0

setup.py

@@ -35,7 +35,7 @@
         'opencv-python==4.1.0.25',
         'Pillow==8.2.0',
         'python-pcl',
-        'PyYAML==5.1.2',
+        'PyYAML==5.4',
         'scikit-learn==0.20.4',
         'scipy==1.2.2',
         'six==1.11.0',