infra: Forgot syntax for Dockerfile.

Author: intersectRaven

Dockerfile

@@ -157,7 +157,7 @@ RUN set -ex; \
     apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false $fetchDeps; \
     rm -rf /var/lib/apt/lists/*
 
-    sed -i 's/8.4/8.5/g' /usr/src/nextcloud/lib/versioncheck.php
+RUN sed -i 's/8.4/8.5/g' /usr/src/nextcloud/lib/versioncheck.php; \
     sed -i 's/80500/80600/g' /usr/src/nextcloud/lib/versioncheck.php
 
 COPY *.sh upgrade.exclude /