fixup! fixup! refactor(pyspark): only allow timezoned timestamps with pyspark < 3.4

Author: cpcloud

ibis/backends/tests/test_temporal.py

@@ -1025,7 +1025,7 @@ def test_timestamp_comparison_filter(backend, con, alltypes, df, func_name):
         comparison_fn(alltypes.timestamp_col.cast("timestamp('UTC')"), ts)
     )
 
-    if (col := df.timestamp_col).dtype.tz is None:
+    if getattr((col := df.timestamp_col).dtype, "tz", None) is None:
         col = df.timestamp_col.dt.tz_localize("UTC")
     expected = df[comparison_fn(col, ts)]
     result = con.execute(expr)
@@ -1059,7 +1059,7 @@ def test_timestamp_comparison_filter_numpy(backend, con, alltypes, df, func_name
 
     ts = pd.Timestamp(ts.item(), tz="UTC")
 
-    if (col := df.timestamp_col).dtype.tz is None:
+    if getattr((col := df.timestamp_col).dtype, "tz", None) is None:
         col = df.timestamp_col.dt.tz_localize("UTC")
     expected = df[comparison_fn(col, ts)]
     result = con.execute(expr)