Update Sonobuoy version used in Dockerfile

    Co-Authored By: Dave Riddle <driddle@vmware.com>

Signed-off-by: James Burchell <jburchell@vmware.com>

scripts/gathere2e/Dockerfile

@@ -1,7 +1,7 @@
 FROM debian:stable-slim
 RUN apt-get update && \
  apt-get -y install wget curl git jq && \
- wget -O /bin/sonobuoy.tar.gz https://github.com/vmware-tanzu/sonobuoy/releases/download/v0.56.11/sonobuoy_0.56.11_linux_amd64.tar.gz && \
+ wget -O /bin/sonobuoy.tar.gz https://github.com/vmware-tanzu/sonobuoy/releases/download/v0.56.13/sonobuoy_0.56.13_linux_amd64.tar.gz && \
  tar -C /bin -xzf /bin/sonobuoy.tar.gz && \
  chmod 755 /bin/sonobuoy