requirements: update networkx requirement from <3.3 to <3.4 (#2955)

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-0.23...networkx-3.3)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -8,7 +8,7 @@ leabra-psyneulink<0.3.3
 llvmlite<0.43
 matplotlib<3.7.6
 modeci_mdf<0.5, >=0.4.3; (platform_machine == 'AMD64' or platform_machine == 'x86_64' or platform_machine == 'arm64' or platform_machine == 'aarch64') and platform_python_implementation == 'CPython' and implementation_name == 'cpython'
-networkx<3.3
+networkx<3.4
 numpy>=1.21.0, <1.26.5
 optuna<3.4.0
 packaging<25.0