[deps] Drop Python 3.9 support, bump networkx to 3.5+

[nemesifier]

Summary

• Dropped Python 3.9 from CI test matrix
• Bumped networkx requirement from >=2.6,<3.5 to >=3.5,<3.8

NetworkX 3.3+ no longer supports Python 3.9 (dropped April 2024), and 3.5+ requires Python 3.11+ (dropped 3.10 in May 2025).

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR updates GitHub Actions CI configuration and dependency constraints. The workflow now triggers pull request builds only for the master branch, removing the gsoc23 branch target. Python test matrix drops version 3.9, keeping 3.10 through 3.13. The networkx dependency constraint is tightened from >=2.6,<3.5 to >=3.5,<3.8.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly relates to the changeset, providing specific details about Python 3.9 removal and NetworkX version updates with relevant rationale.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Bug Fixes	✅ Passed	This PR updates Python/NetworkX versions, not a bug fix. Maintenance updates fall under the exception: "fixes affecting Github Actions workflows."
Title check	✅ Passed	The title uses the [deps] prefix as specified in requirements, clearly describes the main changes (dropping Python 3.9 and updating NetworkX), and aligns with the actual file modifications in the PR.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch drop-old-pythons

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[openwisp-companion]

The CI is failing due to transient infrastructure issues (not related to your code). I have restarted the failed jobs automatically (1/3).

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@requirements.txt`:
- Line 4: The requirements.txt line pinning NetworkX to "networkx>=3.5,<3.8"
conflicts with Python 3.10 in the CI matrix; either remove Python 3.10 from the
CI matrix or constrain NetworkX with Python-version environment markers so 3.10
gets a compatible range and 3.11+ gets networkx>=3.5. Edit requirements.txt to
add two markers: a NetworkX spec that is compatible with Python 3.10 (e.g., an
upper bound below 3.5) for python_version<'3.11' and keep the existing
networkx>=3.5,<3.8 only for python_version>='3.11', or alternatively drop 3.10
from .github/workflows/ci.yml if you intend to require Python 3.11+.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 55872f10-e0d2-4fa0-bcf2-d022169a4c5c

📥 Commits

Reviewing files that changed from the base of the PR and between e876a86 and c06fa41.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• requirements.txt

💤 Files with no reviewable changes (1)

• .github/workflows/ci.yml

📜 Review details

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: Python==3.13
• GitHub Check: Kilo Code Review