gitlab-cancel-outdated-pipelines: pass get_all=True to list()

Otherwse, we won't get the full list of pipelines and python will emit
a warning.

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

tools/gitlab-cancel-outdated-pipelines

@@ -41,7 +41,7 @@ if __name__ == "__main__":
         f"Checking if pipelines for project {args.project_id} need to be cancelled..."
     )
     project = gl.projects.get(args.project_id)
-    list_pipelines = project.pipelines.list()
+    list_pipelines = project.pipelines.list(get_all=True)
 
     current_pipeline = project.pipelines.get(args.current_pipeline_id)
     print(f"Running pipeline: {current_pipeline.id}")