"UTC" is recognized as "Z" to be compatible with the legacy style.

While transferring data from SQL Server to PostgreSQL with Embulk, I get an error as follows.

2023-12-04 19:07:08.875 +0300 [INFO] (0001:transaction): Loaded plugin embulk-input-sqlserver (0.13.2)
2023-12-04 19:07:08.939 +0300 [INFO] (0001:transaction): Loaded plugin embulk-output-postgresql (0.10.3)
2023-12-04 19:07:09.048 +0300 [WARN] (0001:transaction): "UTC" is recognized as "Z" to be compatible with the legacy style.
.
.
.
2023-12-04 19:07:10.042 +0300 [INFO] (0001:transaction): > 0.00 seconds
2023-12-04 19:07:10.090 +0300 [INFO] (0001:transaction): {done: 0 / 1, running: 0}
2023-12-04 19:07:10.117 +0300 [WARN] (0018:task-0000): Z is deprecated as a military time zone name. Use UTC instead.
2023-12-04 19:07:10.122 +0300 [WARN] (0018:task-0000): "Z" is recognized as "Z" to be compatible with the legacy style.

My embulk version: embulk 0.8.38
My postgresql version: 15.4
My java version: 1.8

This is the list of gems in the embulk gem list.
embulk-input-sqlserver (0.13.2 java)
embulk-output-postgresql (0.10.3 java, 0.8.7)