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

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

.gitlab-ci.yml

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