Fix CI (#23)

* Update CI action versions

* Remove stale .flake8 file

.github/workflows/ci.yml

@@ -16,11 +16,11 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
-          python-version: "3.9"
-      - uses: pre-commit/[email protected].0
+          python-version: "3.12"
+      - uses: pre-commit/[email protected].1
 
   test:
     strategy:
@@ -33,44 +33,41 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
-      - name: Set up Python
-        uses: actions/setup-python@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
       - run: pip install pytest pytest-cov -e .
       - run: py.test --cov . --cov-report=xml --cov-report=term-missing
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
 
   mypy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - name: Set up Python
-        uses: actions/setup-python@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
-          python-version: "3.10"
+          python-version: "3.12"
       - run: pip install mypy -e .
       - run: mypy --strict --install-types --non-interactive .
 
   build:
     runs-on: ubuntu-latest
     needs: [lint, test, mypy]
     steps:
-      - uses: actions/checkout@v3
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
-          python-version: "3.10"
+          python-version: "3.12"
       - name: Install pypa/build
         run: python -m pip install build twine --user
       - name: Build a binary wheel and a source tarball
         run: python -m build --sdist --wheel --outdir dist/ .
       - name: Check the distribution
         run: twine check dist/*
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: dist
           path: dist