chore: fix docker image source

I was wrongly pointing to the base repo.

Author: nijel

Dockerfile

@@ -9,7 +9,7 @@ LABEL name="Weblate Dev"
 LABEL maintainer="Michal Čihař <[email protected]>"
 LABEL org.opencontainers.image.url="https://weblate.org/"
 LABEL org.opencontainers.image.documentation="https://docs.weblate.org/en/latest/admin/install/docker.html"
-LABEL org.opencontainers.image.source="https://github.com/WeblateOrg/docker-base"
+LABEL org.opencontainers.image.source="https://github.com/WeblateOrg/docker-dev"
 LABEL org.opencontainers.image.author="Michal Čihař <[email protected]>"
 LABEL org.opencontainers.image.vendor="Weblate"
 LABEL org.opencontainers.image.title="Weblate Dev Image"