MNT: add gh-action automated test runs for python 3.13 (latest)

.github/workflows/run-tests.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.9', '3.10']
+        python-version: ['3.9', '3.10', '3.13']
         pyqt-version: [5.12.3, 5.15.9]
     env:
       DISPLAY: ':99.0'
@@ -36,12 +36,12 @@ jobs:
         miniforge-version: latest
         activate-environment: pydm-env
 
-    - name: Install PyDM with Mamba
+    - name: Install pydm with mamba
       shell: bash -el {0}
       run: |
         mamba install -c conda-forge pydm pyqt=${{ matrix.pyqt-version }}
 
-    - name: Install additional Python dependencies with pip
+    - name: Install additional python dependencies with pip
       shell: bash -el {0}
       run: |
         pip install -r requirements.txt
@@ -51,7 +51,7 @@ jobs:
           pip install -r dev-requirements.txt
         fi
 
-    - name: Install packages for testing a PyQt app on Linux
+    - name: Install packages for testing a pyqt app on Linux
       shell: bash -el {0}
       run: |
         if [ "$RUNNER_OS" == "Linux" ]; then