Update Go to 1.21.7

Update the Omnibus builder images from 5.6.0 to 5.7.0.

The new builder images update:
* Go from 1.21.6 to 1.21.7.
* FIPS Go from 1.21.5 to 1.21.7.

Changelog: changed

Author: Clemens Beck

.gitlab-ci.yml

@@ -42,7 +42,7 @@ variables:
   # To be used for images that exist only on dev.gitlab.org
   DEV_BUILDER_IMAGE_REGISTRY: 'dev.gitlab.org:5005/cookbooks/gitlab-omnibus-builder'
   PUBLIC_BUILDER_IMAGE_REGISTRY: "registry.gitlab.com/gitlab-org/gitlab-omnibus-builder"
-  BUILDER_IMAGE_REVISION: "5.6.0"
+  BUILDER_IMAGE_REVISION: "5.7.0"
   # The registry to pull the assets image from
   ASSET_REGISTRY: "${CI_REGISTRY}"
   ASSET_SYNC_EXISTING_REMOTE_FILES: "keep"