Make black[d] install + test run with 3.12 (#4035)

* Make black[d] install + test run with 3.12

- With aiohttp >= 3.9.0 we can now install all dependencies with 3.12
- Add actions to run 3.12
- Lint still needs to be 3.11

Test:
- `python3.12 -m venv /tmp/tb --upgrade-deps`
- `/tmp/tb/bin/pip install tox`
- `/tmp/tb/bin/pip install .[d]`
- `/tmp/tb/bin/tox -e py312`
```
  py312: OK (37.61=setup[3.98]+cmd[3.83,0.36,19.54,6.46,3.00,0.44] seconds)
  congratulations :) (37.63 seconds)
```

* Move to pypy-3.9

---------

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

.github/workflows/doc.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up latest Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.11"
+          python-version: "*"
 
       - name: Install dependencies
         run: |

.github/workflows/fuzz.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "pypy-3.8"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.9"]
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:

CHANGES.md

@@ -43,7 +43,7 @@
 
 ### Integrations
 
-<!-- For example, Docker, GitHub Actions, pre-commit, editors -->
+- Enable 3.12 CI (#4035)
 
 ### Documentation
 

pyproject.toml

@@ -7,7 +7,7 @@
 
 [tool.black]
 line-length = 88
-target-version = ['py37', 'py38']
+target-version = ['py38']
 include = '\.pyi?$'
 extend-exclude = '''
 /(