[SPARK-37678][PYTHON] Fix _cleanup_and_return signature
[SPARK-37678][PYTHON] Fix _cleanup_and_return signature

### What changes were proposed in this pull request?

This PR fixes return type annotation for  `pandas.groupby.SeriesGroupBy._cleanup_and_return`.

### Why are the changes needed?

Current annotation is incorrect (mixes pandas an pyspark.pandas types).

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Existing tests.

Closes #34950 from zero323/SPARK-37678.

Authored-by: zero323 <0f81822ec43dc7f424811d0a422871ea124aa3dd@gmail.com>
Signed-off-by: Takuya UESHIN <f070f8f0c50caeda5841963fc7b57e73e59dad56@databricks.com>
(cherry picked from commit 012939077627e4f35d9585c5a46281776b770190)
Signed-off-by: Takuya UESHIN <f070f8f0c50caeda5841963fc7b57e73e59dad56@databricks.com>

milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark