fix(java): use Java 8 compatible alternatives in StreamTest generator

[devin-ai-integration]

Description

Refs https://github.com/fern-demo/auth0-java-sdk/pull/63

Fixes the Java SDK's StreamTestGenerator to use Java 8 compatible constructs instead of Java 9+ features (List.of() and Map.of()). This was causing issues in customer SDKs targeting Java 8.

Changes Made

• Replaced List.of() with Arrays.asList() for creating immutable lists
• Replaced Map.of() with a new createMap() helper method using HashMap
• Added proper generics (List<Map<String, String>>, List<String>) instead of raw types
• Used new ArrayList<>() wrapper for the mutable list case in testSseStreamWithTerminator
• Added createCreateMapHelperMethod() to generate the helper
• Added versions.yml entry for version 3.20.1

Testing

• Lint checks pass (pnpm run check)
• Spotless formatting applied (./gradlew spotlessApply)
• Seed tests regenerated via CI

Human Review Checklist

• Verify the generated StreamTest.java will compile with Java 8
• Confirm seed test updates look correct after CI regenerates them
• Check that createMap helper method signature is correct (note: only supports single key-value pairs, which matches current test usage)

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Link to Devin run: https://app.devin.ai/sessions/06daac14c2614877aec913b24cb9de6d
Requested by: [email protected] (@tstanmay13)

[devin-ai-integration]

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