Bump pyyaml from 5.4 to 5.4.1

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.4 to 5.4.1.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.4...5.4.1)

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

setup.py

@@ -29,7 +29,7 @@
         "pdfminer.six==20201018",
         "docopt==0.6.2",
         "wand==0.6.5",
-        "PyYAML==5.4",
+        "PyYAML==5.4.1",
     ],
     extras_require={
         "dev": [