remove networkx pin (#1476)

Author: dependabot[bot]

requirements.txt

@@ -4,7 +4,6 @@ rdflib>=4.2.2,<6.1
 shellescape>=3.4.1,<3.9
 schema-salad>=8.1.20210627200047,<9
 prov==1.5.1
-networkx==2.5.1
 bagit==1.8.1
 mypy-extensions
 psutil>=5.6.6

setup.py

@@ -117,7 +117,6 @@
         "mypy-extensions",
         "psutil >= 5.6.6",
         "prov == 1.5.1",
-        "networkx < 2.6",
         "bagit >= 1.6.4",
         "typing-extensions",
         "coloredlogs",