fix(generator-cli): include version in Gradle installation snippet for Java SDKs

[jsklan]

Description

The generated README.md for Java SDKs included the version number in the Maven installation snippet but omitted it from the Gradle snippet, making the Gradle example non-functional.

Before:

dependencies {
  implementation 'io.intercom:intercom-java'
}

After:

dependencies {
  implementation 'io.intercom:intercom-java:3.0.0'
}

Changes Made

• Added ${maven.version} to the Gradle implementation line in packages/generator-cli/src/readme/ReadmeGenerator.ts (one-line fix, matching the Maven snippet which already included the version)
• Updated 7 generator-cli test snapshots to reflect the new format
• Updated ~150 seed Java SDK README snapshots with the version suffix
• Added 0.6.12 changelog entry in packages/generator-cli/versions.yml
• Bumped Fern CLI version to 4.43.3 in packages/cli/cli/versions.yml so the fix ships in the next CLI release

Testing

• Unit test snapshots updated (generator-cli basic-java + custom-sections/java)
• Seed test results passing (java-sdk and all other generators)
• Manual testing completed

Important Review Notes

• The seed README updates were applied via sed rather than by re-running the seed generator. CI seed tests pass, confirming the snapshots match generated output.
• The core fix is a single-character-level change on one line in ReadmeGenerator.ts:592 — everything else is snapshot/fixture updates.

Human Review Checklist

• Verify 4.43.3 is the correct next CLI version (latest is 4.43.2)
• Confirm irVersion: 65 is correct for the new CLI changelog entry
• Spot-check a few seed README diffs to confirm the :0.0.1 suffix looks right

Link to Devin session: https://app.devin.ai/sessions/d0644705d81c41bbb4034d4e2345b110
Requested by: @jsklan

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