Mailchimp upgrade (#322)

* Upgrading mailchimp to 2.0.10

* Rollback Mixpanel upgrade, should not be part of commit

Author: jonwihl

airbyte-integrations/connectors/source-mailchimp/Dockerfile

@@ -1,7 +1,7 @@
 ARG AIRBYTE_TO_FLOW_TAG="dev"
 FROM ghcr.io/estuary/airbyte-to-flow:$AIRBYTE_TO_FLOW_TAG as airbyte-to-flow
 
-FROM airbyte/source-mailchimp:0.3.5
+FROM airbyte/source-mailchimp:2.0.19
 
 COPY --from=airbyte-to-flow /airbyte-to-flow ./
 ENTRYPOINT ["/airbyte/integration_code/airbyte-to-flow", "--connector-entrypoint", "python /airbyte/integration_code/main.py"]