Bump image to ubi84 and python39

Author: Katherine Black

Dockerfile

@@ -1,8 +1,8 @@
-FROM registry.access.redhat.com/ubi8/ubi-minimal:8.3
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.4
 
 RUN microdnf update \
-    && microdnf install libcurl-devel gcc openssl-devel python38-devel redhat-rpm-config git make ca-certificates diffutils which \
-    && ln -s /usr/bin/pip3.8 /usr/bin/pip \
-    && ln -s /usr/bin/python3.8 /usr/bin/python \
+    && microdnf install libcurl-devel gcc openssl-devel python39-devel redhat-rpm-config git make ca-certificates diffutils which \
+    && ln -s /usr/bin/pip3.9 /usr/bin/pip \
+    && ln -s /usr/bin/python3.9 /usr/bin/python \
     && pip install -U pip \
     && microdnf clean all