fix: Add missing AUTOMOD_NOTIFICATIONS

[retr0-init]

Pull Request Type

• Feature addition
• Bugfix
• Documentation update
• Code refactor
• Tests improvement
• CI/CD pipeline enhancement
• Other: [Replace with a description]

Description

There is a type of embed type missing. The auto moderation notification is added to the enum.

Changes

• Added AUTOMOD_NOTIFICATION to the EmbedType with the content of "auto_moderation_notification"

Related Issues

Test Scenarios

• Create a new server with community feature just enabled. There will be a message from the auto moderation with the "auto_moderation_notification" embed.
• Run async for message in channel.history(limit=0) to get every message

Python Compatibility

• I've ensured my code works on Python 3.10.x
• I've ensured my code works on Python 3.11.x

Checklist

• I've run the pre-commit code linter over all edited files
• I've tested my changes on supported Python versions
• I've added tests for my code, if applicable
• I've updated / added documentation, where applicable