fix(source-zendesk-support): update CDK to prerelease version with OAuth race condition fix

[devin-ai-integration]

What

Updates the source-zendesk-support connector to use a prerelease CDK version that fixes an OAuth race condition where multiple streams starting concurrently with an expired token would all attempt to refresh simultaneously, causing failures with single-use refresh tokens.

Related CDK PR: airbytehq/airbyte-python-cdk#883

How

Updates the baseImage in metadata.yaml from the stable 7.6.5 to the prerelease 7.6.5.post3.dev21398747886 which includes thread-safe token refresh with double-checked locking.

Review guide

1. airbyte-integrations/connectors/source-zendesk-support/metadata.yaml - CDK base image version update and version bump

User Impact

Users authenticating via OAuth with rotating refresh tokens should no longer experience authentication failures when multiple streams start concurrently with an expired token.

Can this PR be safely reverted and rolled back?

• YES 💚

Updates since last revision

• Bumped connector version from 5.0.1 to 5.0.2

---

Requested by: gl_anatolii.yatsuk@airbyte.io

Link to Devin run: https://app.devin.ai/sessions/2f784e9440324787893047ac3a1c0fbc

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[github-actions]

source-zendesk-support Connector Test Results

196 tests   192 ✅  4m 49s ⏱️
  2 suites    4 💤
  2 files      0 ❌

Results for commit 4ae59a4.

♻️ This comment has been updated with latest results.

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