[Tests][Fixed] KiDiff dependency

- We no longer need the kiri_mode branch
- It forces to get 2.5.3, which could fail on concurrent downloads

.github/workflows/pythonapp.yml

@@ -62,11 +62,11 @@ jobs:
         #which pcbnew_do
         #pcbnew_do --version
         # KiDiff tests
-        curl https://codeload.github.com/INTI-CMNB/KiDiff/zip/refs/heads/kiri_mode --output pp.zip
-        unzip pp.zip
-        prefix=/usr make -C KiDiff-kiri_mode install
-        rm -rf KiDiff-kiri_mode/ pp.zip
-        kicad-diff.py --version
+        #curl https://codeload.github.com/INTI-CMNB/KiDiff/zip/refs/heads/kiri_mode --output pp.zip
+        #unzip pp.zip
+        #prefix=/usr make -C KiDiff-kiri_mode install
+        #rm -rf KiDiff-kiri_mode/ pp.zip
+        #kicad-diff.py --version
         ##### End Experimental stuff
         # Ensure we start a fresh coverage meassurement
         python3-coverage erase