```text

Refactor app.py to fix issue with zero-gpu spaces

The app.py file was refactored to address an issue with zero-gpu spaces not working as expected. The issue was discussed in more detail [here](https://huggingface.co/spaces/zero-gpu-explorers/README/discussions/106#66e278a396acd45223e0d00b). Additionally, the pip package was upgraded to the latest version.

app.py

@@ -1,5 +1,7 @@
 # Testing one file gradio app for zero gpu spaces not working as expected.
-# Check here for the issue:
+# Check here for the issue: https://huggingface.co/spaces/zero-gpu-explorers/README/discussions/106#66e278a396acd45223e0d00b
+
+import os
 import gc
 import json
 import random
@@ -49,6 +51,9 @@ from sd_embed.embedding_funcs import get_weighted_text_embeddings_sdxl, get_weig
 
 
 # Initialize System
+os.system("pip install --upgrade pip")
+
+
 def load_sd():
     # device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
     device = "cuda" if torch.cuda.is_available() else "cpu"