Drop support for Python 3.9

Author: ianthomas23

.github/workflows/ci.yml

@@ -23,7 +23,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
@@ -122,7 +121,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.9"]
+        python-version: ["3.10"]
     steps:
       - name: Checkout
         uses: actions/checkout@v5
@@ -153,7 +152,7 @@ jobs:
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
         with:
           dependency_type: minimum
-          python_version: "3.9"
+          python_version: "3.10"
 
       - name: List installed packages
         run: |

.github/workflows/downstream.yml

@@ -97,7 +97,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.9"
+          python-version: "3.10"
           architecture: "x64"
       - name: Install System Packages
         run: |
@@ -129,7 +129,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.9"
+          python-version: "3.10"
           architecture: "x64"
       - name: Install System Packages
         run: |

pyproject.toml

@@ -17,7 +17,7 @@ classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "debugpy>=1.6.5",
     "ipython>=7.23.1",