Declare support for Python 3.11 (#3020)

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9, '3.10', pypy-3.7-v7.x]
+        python-version: [3.7, 3.8, 3.9, '3.10', '3.11', pypy-3.7-v7.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
         include:
           - python-version: 3.7
@@ -18,6 +18,8 @@ jobs:
             py: py39
           - python-version: '3.10'
             py: py310
+          - python-version: '3.11'
+            py: py311
           - python-version: pypy-3.7-v7.x
             py: pypy3
         # Just to slim down the test matrix:
@@ -28,6 +30,10 @@ jobs:
             os: windows-latest
           - python-version: 3.9
             os: ubuntu-latest
+          - python-version: 3.10
+            os: macos-latest
+          - python-version: 3.10
+            os: windows-latest
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
@@ -98,7 +104,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.10'
       - name: Install Hatch
         run: |
           python -m pip install -U hatch

.github/workflows/deploy-release.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.10'
       - name: Install Hatch
         run: |
           python -m pip install -U hatch

pyproject.toml

@@ -23,6 +23,7 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",