gitlab-ci: Use the helper-tools pipeline to update binaries

See glib-gio-fs!2 (merged)

.gitlab-ci.yml

 variables:
   osname: apertis
-  release: v2021dev2
+  release: v2021dev3
 
 include:
   - project: tests/helper-tools
-    ref: apertis/v2021dev2
+    ref: apertis/v2021dev3
     file: /gitlab-ci/update-test-binaries.yaml
 
 update-test-binaries: