gitlab-ci: Update test commit from glib-gio-fs

After the Bullseye rebase the installed tests in glib-gio-fs changed location, so we need to checkout a commit recent enough that the external-binaries.cfg points to the right paths.

.gitlab-ci.yml

@@ -17,4 +17,4 @@ test-glib-gio-fs:
   before_script:
     - git clone "${CI_SERVER_URL}/tests/$REPOSITORY.git/" "$REPOSITORY"
     - cd "$REPOSITORY"
-    - git checkout f86085845450
+    - git checkout 829f401b