Update dependencies and improve Python path handling

Updated several frontend dependencies including MUI packages and added new ones like `@mui/x-charts`. Adjusted the Python path setup in the CI configuration to correctly point to the `aaredb` backend, ensuring accurate module resolution.

backend/config_test.json

@@ -0,0 +1,10 @@
+{
+    "ssl_cert_path": "ssl/mx-aare-test.psi.ch.pem",
+    "ssl_key_path": "ssl/mx-aare-test.psi.ch.key",
+    "OPENAPI_URL": "https://mx-aare-test.psi.ch:8000/openapi.json",
+    "SCHEMA_PATH": "./src/openapi.json",
+    "OUTPUT_DIRECTORY": "./openapi",
+    "PORT": 8081,
+    "SSL_KEY_PATH": "/home/jungfrau/aaredb/backend/ssl/mx-aare-test.psi.ch.key",
+    "SSL_CERT_PATH": "/home/jungfrau/aaredb/backend/ssl/mx-aare-test.psi.ch.pem"
+}