Merge pull request #2009 from brandond/fix_1999

Update sonobuoy version for k8s 1.18 support

Dockerfile.test.dapper

@@ -6,7 +6,7 @@ ARG DAPPER_HOST_ARCH
 ENV ARCH $DAPPER_HOST_ARCH
 
 RUN if [ "${ARCH}" == "amd64" ] || [ "${ARCH}" == "arm64" ]; then \
-        VERSION=0.17.2 OS=linux && \
+        VERSION=0.18.3 OS=linux && \
         curl -sL "https://github.com/vmware-tanzu/sonobuoy/releases/download/v${VERSION}/sonobuoy_${VERSION}_${OS}_${ARCH}.tar.gz" | \
         tar -xzf - -C /usr/local/bin; \
     fi