Upgrade PyYaml dependency

This in response to yaml/pyyaml#601 on MacOS.

Author: rvermeulen

scripts/requirements.txt

@@ -10,7 +10,7 @@ requests==2.31.0
 smmap==3.0.5
 soupsieve==2.0.1
 urllib3==1.26.5
-pyyaml==5.4
+pyyaml==6.0.1
 wheel==0.38.1
 jsonschema==4.9.1
 marko==1.2.1