fix: Add bs4 and fix protobuf version constraint

- Add bs4 to requirements.txt (required by debgpt)
- Pin protobuf to >=3.20,<4 to fix compatibility with electrum
- Resolves dependency conflicts

requirements.txt

@@ -15,3 +15,5 @@ torch
 transformers
 jinja2
 itsdangerous
+bs4
+protobuf>=3.20,<4
\ No newline at end of file