Fix static-sdk JSON 6.2 API

[yonihemi]

Fix static-sdk JSON API for 6.2 branch

Motivation:

• Static SDKs JSON API returns null for 6.2 branch.
• OpenAPI spec doesn't include branch 6.2 so tests don't catch this.

Modifications:

• Fixed the yaml data source path of the JSON API.
• Added branches 6.1, 6.2 to OpenAPI spec.

Result:

• /api/v1/install/dev/6.2/static-sdk.json returns a valid value.
• Local test now also tests branches 6.1, 6.2 and passes.