[devin-ai-integration]

What

Bumps the source-declarative-manifest base image for Amazon Seller Partner to CDK prerelease 7.21.1.post4.dev27198638142, which includes the fix for config validation errors caused by null optional fields.

Resolves the "Config validation error: None is not of type 'string'" errors affecting 103+ connections since 2026-06-08.

CDK fix PR: airbytehq/airbyte-python-cdk#1046

How

Updated connectorBuildOptions.baseImage in metadata.yaml from source-declarative-manifest:7.19.3 to the prerelease source-declarative-manifest:7.21.1.post4.dev27198638142.

Review guide

1. airbyte-integrations/connectors/source-amazon-seller-partner/metadata.yaml

User Impact

Connections that were failing with "Config validation error: None is not of type 'string'" will resume syncing successfully. The CDK now strips null values from optional config fields before validation and reports all validation errors (with field paths) in a single message.

Can this PR be safely reverted and rolled back?

• YES 💚

Requested by @gl_anatolii.yatsuk.

---

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