Bump GRPC version

Match other dockerfiles, allows support for s390x

Author: Jamstah

upstream-opm-builder.Dockerfile

@@ -9,7 +9,7 @@ COPY pkg pkg
 COPY Makefile Makefile
 COPY go.mod go.mod
 RUN make static
-RUN GRPC_HEALTH_PROBE_VERSION=v0.2.1 && \
+RUN GRPC_HEALTH_PROBE_VERSION=v0.3.2 && \
     wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-$(go env GOARCH) && \
     chmod +x /bin/grpc_health_probe