Use 3.12 and not 3.7 in CI

.github/workflows/build.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@v3
 
@@ -25,14 +25,12 @@ jobs:
         run: poetry install --with lint --with tests
 
       - uses: pre-commit/action@v3.0.0
-        if: matrix['python-version'] != '3.7'
 
       - name: Test with pytest
         run: |
           poetry run pytest
 
       - name: Test readme notebook
-        if: matrix['python-version'] != '3.7'
         run: |
           poetry install --with readme
           poetry run jupyter nbconvert --to markdown README.ipynb