Use builder image with Go 1.14.7

Signed-off-by: Balasankar "Balu" C <balasankarc@autistici.org>

.gitlab-ci.yml

@@ -42,7 +42,7 @@ variables:
   # will use images from that registry and not depend on GitLab.com
   BUILDER_IMAGE_REGISTRY: "registry.gitlab.com/gitlab-org/gitlab-omnibus-builder"
   PUBLIC_BUILDER_IMAGE_REGISTRY: "registry.gitlab.com/gitlab-org/gitlab-omnibus-builder"
-  BUILDER_IMAGE_REVISION: "0.0.70"
+  BUILDER_IMAGE_REVISION: "0.0.71"
   # The registry to pull the assets image from
   ASSET_REGISTRY: "${CI_REGISTRY}"
   ASSET_SYNC_EXISTING_REMOTE_FILES: "keep"