chore: Upgrade Toolkit to v2.1.1

[Artmann]

The breaking change is the removal of support for Python 3.9.

Summary by CodeRabbit

• Chores
  • Updated Deepnote Toolkit version to 2.1.1

[coderabbitai]

📝 Walkthrough

Walkthrough

The public constant DEEPNOTE_TOOLKIT_VERSION in src/kernels/deepnote/types.ts has been updated from version '1.1.0' to '2.1.1'. No functional logic or structural changes were made—only the exported constant value was modified.

🚥 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 accurately reflects the main change: upgrading the toolkit version constant from 1.1.0 to 2.1.1.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0%. Comparing base (78923a2) to head (f178c38).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #311   +/-   ##
===========================
===========================

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