Update testing.yml

- removed 3.9
- added 3.12

Author: alexlib

.github/workflows/testing.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.10", "3.11","3.12"]
         poetry-version: [1.5.0]
 
     steps:
@@ -24,4 +24,4 @@ jobs:
     - name: Install the project dependencies
       run: poetry install
     - name: Run the automated tests (for example)
-      run: poetry run pytest openpiv -v
+      run: poetry run pytest openpiv -v