feat: remove python 3.9

[FilipPyrek]

Summary by CodeRabbit

• Chores
  • Updated minimum Python version requirement from 3.9 to 3.10
  • Updated supported Python versions to include 3.10, 3.11, 3.12, and 3.13
  • Updated CI/CD pipelines and test environments to reflect new Python version matrix
  • Simplified and unified dependency constraints across platform-specific configurations

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[linear]

BLU-5451 Remove python 3.9 code from toolkit

[github-actions]

📦 Python package built successfully!

• Version: 1.2.2.dev3+e5b18fa
• Wheel: deepnote_toolkit-1.2.2.dev3+e5b18fa-py3-none-any.whl
• Install:

  pip install "deepnote-toolkit @ https://deepnote-staging-runtime-artifactory.s3.amazonaws.com/deepnote-toolkit-packages/1.2.2.dev3%2Be5b18fa/deepnote_toolkit-1.2.2.dev3%2Be5b18fa-py3-none-any.whl"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.27%. Comparing base (4d76844) to head (c61408e).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #59   +/-   ##
=======================================
  Coverage   73.27%   73.27%           
=======================================
  Files          93       93           
  Lines        5193     5193           
  Branches      757      757           
=======================================
  Hits         3805     3805           
  Misses       1144     1144           
  Partials      244      244           

Flag	Coverage Δ
combined	73.27% <ø> (ø)

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[coderabbitai]

📝 Walkthrough

Walkthrough

Python 3.9 support is being dropped across the project. The minimum supported version shifts to Python 3.10, affecting CI/CD workflows (GitHub Actions), local development (noxfile), package metadata (pyproject.toml), and documentation. All Python 3.9-specific conditional logic, classifiers, and dependency pins have been removed or consolidated, with the supported matrix now spanning 3.10 through 3.13.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	Title clearly and concisely summarizes the main change: removing Python 3.9 support across the entire codebase.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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[coderabbitai]

Actionable comments posted: 0

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

pyproject.toml (1)

57-59: Redundant duckdb constraints.

Lines 57-58 have identical version ranges. Consider consolidating:

-    "duckdb>=1.1.0,<2.0.0; python_version < '3.12'",
-    "duckdb>=1.1.0,<2.0.0; python_version >= '3.12'",
+    "duckdb>=1.1.0,<2.0.0; python_version < '3.13'",
     "duckdb>=1.4.1,<2.0.0; python_version >= '3.13'",

[deepnote-bot]

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🌍 Review application	ra-59
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⏰ Last deployed	2026-01-20 16:36:20 (UTC)
📜 Deployed commit	115e2d9c64c4719ed44a70e56dbb810a8f165fcc
🛠️ Toolkit version	e5b18fa

[FilipPyrek]

Related PR: deepnote/environments#65