[deps] Update networkx requirement from <2.5,>=2.0 to >=2.0,<3.4

Updates the requirements on [networkx](https://github.com/networkx/networkx) to permit the latest version.
- [Release notes](https://github.com/networkx/networkx/releases)
- [Commits](networkx/networkx@networkx-2.0...networkx-3.3)

---
updated-dependencies:
- dependency-name: networkx
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,4 +1,4 @@
 requests<3.0
 libcnml<0.10.0
 openvpn-status>=0.2,<0.3
-networkx>=2.0,<2.5
+networkx>=2.0,<3.4