chore: remove sed package

Signed-off-by: xjasonlyu <xjasonlyu@gmail.com>

deploy/docker/Dockerfile

@@ -32,9 +32,6 @@ ENV MAINTAINER="emqx.io" \
 ARG KUIPER_USER="kuiper"
 ARG KUIPER_USER_ID="1001"
 
-# (root) Add packages and "kuiper" user
-RUN apk add sed
-
 WORKDIR ${KUIPER_HOME}
 
 # Set appropriate ownership to allow binary full access to KUIPER_HOME dir