ci: bump checkout/upload-artifact/setup-python actions to current versions

.github/workflows/appimage-build.yml

@@ -17,7 +17,7 @@ jobs:
       artifact-metadata: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: true
 
@@ -217,7 +217,7 @@ jobs:
           subject-path: Zoitechat-*-x86_64.AppImage
 
       - name: Upload AppImage artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: zoitechat-appimage
           path: Zoitechat-*-x86_64.AppImage