Update Github CI jobs to include Python 3.13 in tests

Author: mathoudebine

.github/workflows/simple-program-linux.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/simple-program-macos.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/simple-program-windows.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/system-monitor-linux.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
         theme: [ "3.5inchTheme2" ]
 
     steps:

.github/workflows/system-monitor-macos.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
         theme: [ "3.5inchTheme2" ]
 
     steps:

.github/workflows/system-monitor-windows.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
         theme: [ "3.5inchTheme2" ]
 
     steps:

.github/workflows/themes-screenshot-on-pr.yml

@@ -10,10 +10,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python 3.10
+    - name: Set up Python 3.x
       uses: actions/setup-python@v5
       with:
-        python-version: "3.11"
+        python-version: "3.13"
 
     - name: Install dependencies
       run: |

.github/workflows/themes-screenshot-on-push.yml

@@ -21,10 +21,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python 3.10
+    - name: Set up Python 3.x
       uses: actions/setup-python@v5
       with:
-        python-version: "3.11"
+        python-version: "3.13"
 
     - name: Install dependencies
       run: |