CI: Stop testing 3.7

Author: effigies

.github/workflows/stable.yml

@@ -91,7 +91,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'windows-latest', 'macos-latest']
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
         architecture: ['x64', 'x86']
         install: ['pip']
         check: ['test']
@@ -101,31 +101,31 @@ jobs:
         include:
           # Basic dependencies only
           - os: ubuntu-latest
-            python-version: 3.7
+            python-version: 3.8
             install: pip
             check: test
             pip-flags: ''
             depends: REQUIREMENTS
             optional-depends: ''
           # Absolute minimum dependencies
           - os: ubuntu-latest
-            python-version: 3.7
+            python-version: 3.8
             install: pip
             check: test
             pip-flags: ''
             depends: MIN_REQUIREMENTS
             optional-depends: ''
           # Absolute minimum dependencies plus old MPL, Pydicom, Pillow
           - os: ubuntu-latest
-            python-version: 3.7
+            python-version: 3.8
             install: pip
             check: test
             pip-flags: ''
             depends: MIN_REQUIREMENTS
             optional-depends: MIN_OPT_DEPENDS
           # Clean install imports only with package-declared dependencies
           - os: ubuntu-latest
-            python-version: 3.7
+            python-version: 3.8
             install: pip
             check: skiptests
             pip-flags: ''