feat(Dependencies): Update dependency keystoneauth1 to v5.6.0

| datasource | package       | from  | to    |
| ---------- | ------------- | ----- | ----- |
| pypi       | keystoneauth1 | 5.4.0 | 5.6.0 |

requirements.txt

@@ -22,7 +22,7 @@ iso8601==2.1.0; python_version < '4' and python_full_version >= '3.6.2'
 jmespath==1.0.1; python_version >= '3.7'
 jsonpatch==1.33; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 jsonpointer==2.4; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
-keystoneauth1==5.4.0; python_version >= '3.6'
+keystoneauth1==5.6.0; python_version >= '3.6'
 maya==0.6.1
 munch==4.0.0
 netifaces==0.11.0