bin/ci: update python-gitlab to 4.x

Quite a few fixes that we want were in the 4.x releases, so let's bump it.

See the list of breaking changes here:
https://python-gitlab.readthedocs.io/en/stable/changelog.html#v4-0-0-2023-10-17

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30019>

bin/ci/ci_post_gantt.py

@@ -82,7 +82,7 @@ def gitlab_post_reply_to_note(gl, event, reply_message):
         merge_request = project.mergerequests.get(merge_request_iid)
 
         # Find the discussion to which the note belongs
-        discussions = merge_request.discussions.list(as_list=False)
+        discussions = merge_request.discussions.list(iterator=True)
         target_discussion = next(
             (
                 d

bin/ci/requirements.txt

@@ -5,7 +5,7 @@ kaleido==0.2.*
 python-dateutil==2.*
 pandas==2.*
 plotly==5.*
-python-gitlab==3.*
+python-gitlab==4.*
 PyYAML==6.*
 ruamel.yaml.clib==0.2.*
 ruamel.yaml==0.17.*

bin/ci/update_traces_checksum.py

@@ -69,7 +69,7 @@ def gather_results(
                 target = yaml.load(target_file)
 
                 # parse artifact
-                results_json_bz2 = cur_job.artifact(path="results/results.json.bz2", streamed=False)
+                results_json_bz2 = cur_job.artifacts.raw(artifact_path="results/results.json.bz2")
                 results_json = bz2.decompress(results_json_bz2).decode("utf-8", errors="replace")
                 results = json.loads(results_json)