chore(deps): pin dependencies

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   qdrant:
-    image: docker.io/qdrant/qdrant:latest@sha256:75eab8c4ba42096724fdcfde8b4de0b5713d529dde32f285a1f86fdcb2c9e50c
+    image: docker.io/qdrant/qdrant:latest
     container_name: mcp_maildir_qdrant
     ports:
       - "127.0.0.1:6333:6333" # REST API

pkg/Dockerfile

@@ -1,5 +1,5 @@
 # 3.13, because with 3.14 it requires gcc (wheels not available)
-FROM docker.io/library/python:3.14-slim@sha256:c845af9399020c7e562969a13689e929074a10fd057acd1b1fad06a2fb068e97
+FROM docker.io/library/python:3.14-slim
 
 # Set environment variables
 ENV PYTHONDONTWRITEBYTECODE=1