bump garden-integration-tests
bump garden-integration-tests

Submodule src/code.cloudfoundry.org/garden-integration-tests 776add5..08117ce:
  > Reduce the amount of memory we try to allocate to mitigate flaky test

Signed-off-by: Petar Petrov <f705c0aa8aaf6bd313d55f7f3f71a8729abdecaa@gmail.com>

cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release