Update python in CI

[SamTov]

Summary by CodeRabbit

• New Features

  • Official support for Python 3.12 (tests now run on 3.12).

• Chores

  • Updated dependencies: added mitsuba; relaxed minimum versions for open3d (≥0.17.0) and numpy (≥1.26.4).
  • Modernized CI workflows and linters to latest stable actions with improved permissions and checks.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

CI workflows updated: actions upgraded to v4, pull_request trigger and read permissions added, Python set to 3.12 for lint and tests, and explicit isort/flake8 steps added. Dependencies relaxed for open3d/numpy and mitsuba added in requirements.txt.

Changes

Cohort / File(s)	Summary of Changes
CI workflows .github/workflows/lint.yaml, .github/workflows/pytest.yaml	Upgrade actions/checkout and setup-python to v4; add pull_request trigger and permissions: contents: read; set Python 3.12 for isort/flake8 and test matrix; add explicit isort --check-only and flake8 command steps.
Dependencies requirements.txt	Relax open3d (>=0.17.0) and numpy (>=1.26.4) constraints; add mitsuba; retain other pins.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

Thump-thump go my reviewer feet,
New lint and tests are crisp and neat.
Python hopped to 3.12’s glade,
Requirements trimmed, new shade of jade.
With mitsuba in the meadow bright,
I nibble green checks by moonlight.
(_/)> ✅

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch play-with-workflos

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1f2157a and 88edeab.

📒 Files selected for processing (3)

• .github/workflows/lint.yaml (2 hunks)
• .github/workflows/pytest.yaml (1 hunks)
• requirements.txt (1 hunks)

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