Update pyyaml requirement from <5.4,>=5.1 to >=5.1,<5.5 (#727)

dependabot[bot] · web-flow · commit b9c2c4f58d4f · 2021-02-12T23:02:30.000+01:00
diff --git a/requirements/requirements.txt b/requirements/requirements.txt
@@ -2,7 +2,7 @@ boto3~=1.17.7
 cryptography==3.3.2
 marshmallow==3.10.0
 packaging==20.9
-PyYAML>=5.1,<5.4
+PyYAML>=5.1,<5.5
 requests==2.25.1
 unix-ar==0.2.1
 wrapt==1.12.1
