Drop python 3.7 from CI

.github/workflows/python.yml

@@ -5,17 +5,10 @@ on: [push]
 jobs:
   build:
 
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-        os: [ubuntu-latest]
-        include:
-          - python-version: "3.7"
-            os: ubuntu-20.04
-        exclude:
-          - python-version: "3.7"
-            os: ubuntu-latest
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
@@ -32,7 +25,7 @@ jobs:
       - name: Lint with ruff
         run: |
           # stop the build if there are Python syntax errors or undefined names
-          ruff check --output-format=github --select=E9,F63,F7,F82 --target-version=py37 .
+          ruff check --output-format=github --select=E9,F63,F7,F82 --target-version=py38 .
       - name: Test with pytest
         run: |
           pytest --cov=photo_importer --cov-report=term-missing --cov-fail-under=85