Fix error from casting asList return to Iterator

[glenhein]

What does this PR do?

The GeotoolsPluginLoader was casting Arrays.asList() to Iterator. This no longer works in jdk17.

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What are the relevant tickets?

Fixes: #____

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Checklist:

• Documentation Updated
• Update / Add Threat Dragon models
• Update / Add Unit Tests
• Update / Add Integration Tests

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[jlcsmith]

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