[ci] goreleaser uses go 1.27 where json v2 is enabled, the env var has to be cleaned there.

Author: zachmann

.gitlab-ci.yml

@@ -105,6 +105,7 @@ package:
 #      - tags
 #      - prerel
   variables:
+    GOEXPERIMENT: ""
     GIT_STRATEGY: clone
     GIT_DEPTH: 0
     REPO_HOST: repo.data.kit.edu