Update registry.access.redhat.com/ubi9/ubi-minimal Docker digest to 21ed5a0 (opendatahub-io#364)

Signed-off-by: konflux-internal-p02 <170854209+konflux-internal-p02[bot]@users.noreply.github.com>
Co-authored-by: konflux-internal-p02[bot] <170854209+konflux-internal-p02[bot]@users.noreply.github.com>

Author: konflux-internal-p02[bot]

Dockerfile.konflux

@@ -33,7 +33,7 @@ RUN GOOS=${TARGETOS:-linux} \
 # Stage 2: Copy build assets to create the smallest final runtime image
 ###############################################################################
 #ubi-minimal:latest
-FROM registry.access.redhat.com/ubi9/ubi-minimal@sha256:a50731d3397a4ee28583f1699842183d4d24fadcc565c4688487af9ee4e13a44 AS runtime
+FROM registry.access.redhat.com/ubi9/ubi-minimal@sha256:21ed5a01130d3a77eb4a26a80de70a4433860255b394e95dc2c26817de1da061 AS runtime
 
 ARG USER=2000
 ARG IMAGE_VERSION