chore(deps): update dependency jeboehm/mailserver-admin to v5.5.5 (#557)

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

Author: renovate[bot]

target/web/Dockerfile

@@ -70,7 +70,7 @@ RUN --mount=type=cache,target=/root/.composer \
         ${RC_PLUGINS}; \
     fi
 
-ARG ADMIN_VER=5.5.4 # renovate: depName=jeboehm/mailserver-admin
+ARG ADMIN_VER=5.5.5 # renovate: depName=jeboehm/mailserver-admin
 WORKDIR /opt/manager
 RUN --mount=type=cache,target=/root/.composer \
     curl -sSLf \