chore: bump the dependencies and set pinned versions in pipfile for t…

…he backend

backend/Pipfile

@@ -9,18 +9,18 @@ verify_ssl = true
 name = "pytorch"
 
 [packages]
-fastapi = "*"
-uvicorn = {extras = ["standard"], version = "*"}
-supabase = "*"
-python-dotenv = "*"
-trafilatura = "*"
-lxml = "*"
-langchain = "*"
-requests = "*"
-openai = "*"
-llama-index-readers-file = "*"
-httpx = "*"
-pymupdf = "*"
+fastapi = "==0.110.2"
+uvicorn = {extras = ["standard"], version = "==0.29.0"}
+supabase = "==2.4.3"
+python-dotenv = "==1.0.1"
+trafilatura = "==1.8.1"
+lxml = "==5.1.1"
+langchain = "==0.1.16"
+requests = "==2.31.0"
+openai = "==1.23.2"
+llama-index-readers-file = "==0.1.19"
+httpx = "==0.27.0"
+pymupdf = "==1.24.2"
 
 [dev-packages]