chore: update Docker dependencies

Author: evansims

docker/fdb-integration-tests/Dockerfile

@@ -2,7 +2,7 @@
 # This container runs InferaDB Management API tests against a real FDB instance
 # For integration testing only - not for production use
 
-FROM rust:1.83-slim
+FROM rust:1.91-slim
 
 # Set environment variables for non-interactive installation
 ENV DEBIAN_FRONTEND=noninteractive