fix python 3.9 compatibility

src/jobflow_remote/jobs/jobcontroller.py

@@ -3881,8 +3881,14 @@ def lock_job_for_update(
                 no_retry = True
             except RemoteError as e:
                 error = f"Remote error: {e.msg}"
-                if e.__cause__:
-                    trace = traceback.format_exception(e.__cause__)
+                cause = e.__cause__
+                if cause:
+                    # this is required for support of python 3.9. In 3.10 the API
+                    # changed and format_exception(e) could be used instead.
+                    # Do that if/when support for 3.9 is dropped.
+                    trace = traceback.format_exception(
+                        type(cause), cause, cause.__traceback__
+                    )
                     error += "\ncaused by:\n" + "".join(trace)
                 no_retry = e.no_retry
             except Exception:

tests/db/utils/test_data.py

@@ -55,7 +55,7 @@ def test_get_past_time_rounded():
 def test_get_utc_offset():
     from jobflow_remote.utils.data import get_utc_offset
 
-    assert get_utc_offset("America/Los_Angeles") == "-07:00"
+    assert get_utc_offset("America/Buenos_Aires") == "-03:00"
     assert get_utc_offset("Europe/Moscow") == "+03:00"
     assert get_utc_offset("UTC") == "+00:00"
     assert get_utc_offset("Asia/Shanghai") == "+08:00"