update PyYAML to 6.0.1

Author: thebjorn

requirements.txt

@@ -1,14 +1,11 @@
-setuptools<45;		python_version < "3"
-setuptools>=65.5.1; python_version >= "3"
-
-PyYAML>=3.12
-enum34==1.0.4;		python_version < "3.4"
+setuptools<45                  ; python_version < "3"
+setuptools>=65.5.1             ; python_version >= "3"
+PyYAML==6.0.1
+enum34==1.0.4                  ; python_version < "3.4"
 stdlib-list>=0.6.0
-
 tomlkit>=0.7.0
-
 coverage>=5.5
 pytest>=4.6
 pytest-cov>=2.12.1
-
 Sphinx>=1.7.6
+