fix(deps, ci): Align Python requirement (>=3.10) with mcp dependency

Resolves GitHub Actions CI failures during dependency installation. The `mcp` package requires Python 3.10 or higher, causing the build to fail on the previous Python 3.9 runner.

This commit:
- Updates `pyproject.toml` to set `requires-python = ">=3.10"`.
- Modifies the CI workflow matrix in `.github/workflows/ci.yml` to test against Python versions 3.10, 3.11, and 3.12, removing the incompatible 3.9 version.

Author: jbeno

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.9", "3.12" ] # Test on supported Python versions
+        python-version: [ "3.10", "3.11", "3.12" ] # Test on supported Python versions (mcp requires >=3.10)
 
     steps:
     - uses: actions/checkout@v4

pyproject.toml

@@ -10,7 +10,7 @@ authors = [
 ]
 description = "Model Context Protocol (MCP) implementation for Jupyter notebooks to overcome limitation with Cursor"
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = { file = "LICENSE" }
 keywords = ["jupyter", "notebook", "mcp", "cursor", "ai", "agent", "nbformat", "ipynb"]
 classifiers = [