chore: update Dockerfile sha

Signed-off-by: Lance Ball <lball@redhat.com>

Dockerfile

@@ -29,7 +29,7 @@ RUN go build -ldflags "${SERVER_LDFLAGS}" ./cmd/timestamp-server
 RUN CGO_ENABLED=0 go build -gcflags "all=-N -l" -ldflags "${SERVER_LDFLAGS}" -o timestamp-server_debug ./cmd/timestamp-server
 
 # debug compile options & debugger
-FROM registry.access.redhat.com/ubi9/go-toolset@sha256:c3a9c5c7fb226f6efcec2424dd30c38f652156040b490c9eca5ac5b61d8dc3ca as debug
+FROM brew.registry.redhat.io/rh-osbs/openshift-golang-builder:rhel_9_1.21@sha256:98a0ff138c536eee98704d6909699ad5d0725a20573e2c510a60ef462b45cce0 AS debug
 RUN go install github.com/go-delve/delve/cmd/dlv@v1.9.0
 
 # overwrite server and include debugger