reformatted workflow to work with acceptable numpy versions

Author: lukestroh

.github/workflows/run_tests.yaml

@@ -10,7 +10,7 @@ jobs:
             fail-fast: true
             matrix:
                 os: [ubuntu-latest, macos-latest, windows-latest]
-                python-version: ['3.8', '3.9', '3.10', '3.11']
+                python-version: ['3.9', '3.10', '3.11', '3.12']
 
         runs-on: ${{ matrix.os }}
         steps:
@@ -32,3 +32,8 @@ jobs:
               with:
                   python-version: ${{ matrix.python-version }}
                   options: "--check --verbose --diff --line-length=120 ./"
+            
+            - name: Lint with flake8
+              run: |
+                  # stop the build if there are Python syntax errors or undefined names
+                  $ flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics