updated the requirements.txt with pinned version

Signed-off-by: lochanpaudel <lochanpaudel10@gmail.com>

Author: nahcol10

src/mvt/requirements.txt

@@ -1,20 +1,20 @@
-torch
-mistralai
-faiss-cpu
-requests
-python-dotenv
-langchain
-langchain-community
-langchain-mistralai
-beautifulsoup4
-transformers
-fastapi
-uvicorn
-streamlit
-streamlit-authenticator
+torch==2.8.0
+mistralai==1.9.7
+faiss-cpu==1.12.0
+requests==2.32.5
+python-dotenv==1.1.1
+langchain==0.3.27
+langchain-community==0.3.27
+langchain-mistralai==0.2.11
+beautifulsoup4==4.13.4
+transformers==4.55.4
+fastapi==0.116.1
+uvicorn==0.35.0
+streamlit==1.48.1
+streamlit-authenticator==0.4.2
 youtube-transcript-api==0.6.3
-pypdf
-chardet
-sentence-transformers
-lxml
-Authlib
+pypdf==6.0.0
+chardet==5.2.0
+sentence-transformers==5.1.0
+lxml==6.0.1
+Authlib==1.6.2