fix: simplify additionalDependencies in gen.yaml to match v2 schema

Remove nested dependencies/extraDependencies structure that is
incompatible with Speakeasy v2. Use flat empty object like the
terraform provider.

Co-Authored-By: AJ Steers <aj@airbyte.io>

Author: devin-ai-integration[bot]

gen.yaml

@@ -14,10 +14,7 @@ generation:
     oAuth2PasswordEnabled: false
 python:
   version: 1.0.0
-  additionalDependencies:
-    dependencies: {}
-    extraDependencies:
-      dev: ""
+  additionalDependencies: {}
   author: Airbyte
   clientServerStatusCodesAsErrors: true
   defaultErrorName: SDKError