ci: drop packet.net tag on git archive job

We are no longer on that infrastructure, and we no longer need to
specify which one we are on.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34271>

.gitlab-ci.yml

@@ -333,9 +333,6 @@ make git archive:
   stage: git-archive
   rules:
     - !reference [.scheduled_pipeline-rules, rules]
-  # ensure we are running on packet
-  tags:
-    - packet.net
   script:
     # Compactify the .git directory
     - git gc --aggressive