fix: upgrade to latest UBI 8.4 (#848)

Dockerfile.release

@@ -1,6 +1,6 @@
-FROM registry.access.redhat.com/ubi8/ubi-minimal:8.3
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.4
 
-ARG RELEASE
+ARG TAG
 
 COPY CREDITS /licenses/CREDITS
 COPY LICENSE /licenses/LICENSE
@@ -8,8 +8,8 @@ COPY LICENSE /licenses/LICENSE
 LABEL name="MinIO" \
       vendor="MinIO Inc <dev@min.io>" \
       maintainer="MinIO Inc <dev@min.io>" \
-      version="${RELEASE}" \
-      release="${RELEASE}" \
+      version="${TAG}" \
+      release="${TAG}" \
       summary="A graphical user interface for MinIO" \
       description="MinIO object storage is fundamentally different. Designed for performance and the S3 API, it is 100% open-source. MinIO is ideal for large, private cloud environments with stringent security requirements and delivers mission-critical availability across a diverse range of workloads."