[SPARK-26499][SQL][FOLLOW-UP] Replace update with setByte for ByteType in JdbcUtils.makeGetter

[maropu]

What changes were proposed in this pull request?

This is a follow-up pr to fix the code coming from #23400; it replaces update with setByte for ByteType in JdbcUtils.makeGetter.

Why are the changes needed?

For better code.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Existing tests.

[dongjoon-hyun]

+1, LGTM.

[SparkQA]

Test build #113818 has finished for PR 26532 at commit 04c525b.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[maropu]

retest this please

[SparkQA]

Test build #113826 has finished for PR 26532 at commit 04c525b.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

The test cases should be fixed as of 65a189c

[HyukjinKwon]

retest this please

[maropu]

Oh, nice! Thanks for the re-trigger.

[SparkQA]

Test build #113841 has finished for PR 26532 at commit 04c525b.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #4935 has finished for PR 26532 at commit 04c525b.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[srowen]

Merged to master. The change was already in 2.4 from another related commit