Update Dockerfile for Telegram Bot API version 9.6

Updated the build version from 9.4 to 9.6 and added version label.

Author: hanwg

docker/Dockerfile

@@ -1,6 +1,6 @@
 ARG BUILD_NAME="Home Assistant Addon: Telegram Bot API"
 ARG BUILD_DESCRIPTION="Docker image for Telegram Bot API. Built for Home Assistant as an addon."
-ARG BUILD_VERSION="9.4"
+ARG BUILD_VERSION="9.6"
 ARG BUILD_ARCH="amd64"
 
 # build from source
@@ -48,4 +48,4 @@ LABEL \
   org.opencontainers.image.licenses="MIT" \
   org.opencontainers.image.source="https://github.com/hanwg/telegram-bot-api" \
   org.opencontainers.image.documentation="https://github.com/hanwg/telegram-bot-api/blob/main/README.md" \
-  org.opencontainers.image.version=${BUILD_VERSION}
+  org.opencontainers.image.version=${BUILD_VERSION}