[FLINK-12001][tests] fix the external jar path config error for AvroE…

[sunjincheng121]

What is the purpose of the change

fix the external jar path config error for AvroExternalJarProgramITCase.

Brief change log

• fix the external jar path config error for AvroExternalJarProgramITCase.

Verifying this change

This change is already covered by existing tests.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? ( no)
• If yes, how is the feature documented? ( not documented)

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Review Progress

• ✅ 1. The [description] looks good.
  • Approved by @sunjincheng121 [committer]
• ✅ 2. There is [consensus] that the contribution should go into to Flink.
  • Approved by @sunjincheng121 [committer]
• ❓ 3. Needs [attention] from.
• ✅ 4. The change fits into the overall [architecture].
  • Approved by @sunjincheng121 [committer]
• ✅ 5. Overall code [quality] is good.
  • Approved by @sunjincheng121 [committer]

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[sunjincheng121]

@flinkbot attention @zentol @aljoscha

[sunjincheng121]

@flinkbot approve all
Will be merged...