Update versions of libraries in poetry.

PATCH bump source-mailgun version to 0.2.17
Build source-mailgun docker image for platform(s) linux/amd64, linux/arm64
Get dependency updates
Create or update pull request on Airbyte repository
Add changelog entry

Author: alafanechere

airbyte-integrations/connectors/source-mailgun/metadata.yaml

@@ -10,7 +10,7 @@ data:
   connectorSubtype: api
   connectorType: source
   definitionId: 5b9cb09e-1003-4f9c-983d-5779d1b2cd51
-  dockerImageTag: 0.2.16
+  dockerImageTag: 0.2.17
   dockerRepository: airbyte/source-mailgun
   documentationUrl: https://docs.airbyte.com/integrations/sources/mailgun
   githubIssueLabel: source-mailgun