Update dependency django-templated-email to v3

This MR contains the following updates:

Package	Type	Update	Change
django-templated-email	dependencies	major	^2.3.0 -> ^3.0.0

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Release Notes

vintasoftware/django-templated-email

v3.0.0

Compare Source

• Add escaping to HTML parts in templates
• Add tests for django main version

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