Update nextcloud Docker tag to v30.0.6 (#613)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

30/Dockerfile

@@ -10,7 +10,7 @@ RUN set -ex; \
     go install;
 
 
-FROM nextcloud:30.0.5-fpm@sha256:1654f68700a482a13feca52c3235b949d8771624d738c17e9c82e437fe5de5ec
+FROM nextcloud:30.0.6-fpm@sha256:35816840281aa2fa2d5630d981ce32c72388f5e885d9ea1be43b38c76ab95d42
 
 COPY --from=supercronic /go/bin/supercronic /usr/local/bin/supercronic