chore: upgrade pip in Dockerfile and update dependencies.

Dockerfile

@@ -2,6 +2,7 @@ FROM python:3.10-slim
 WORKDIR /app
 
 COPY requirements.txt .
+RUN pip install --upgrade pip
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . .

requirements.txt

@@ -2,13 +2,13 @@ fastapi==0.124.4
 uvicorn==0.38.0
 python-multipart==0.0.20
 python-dotenv==1.2.1
-langchain==0.3.0
-langchain-groq==0.2.0
-langchain-huggingface==0.1.0
-langchain-chroma==0.1.4
-langchain-community==0.3.0
-langchain-experimental==0.4.1
-chromadb==0.5.23
+langchain~=0.3.0
+langchain-groq~=0.2.0
+langchain-huggingface~=0.1.0
+langchain-chroma~=0.1.4
+langchain-community~=0.3.0
+langchain-experimental~=0.4.1
+chromadb>=0.5.23
 pypdf==6.4.1
 sentence-transformers==5.2.0
 aiofiles==24.1.0