fix(deps): update module github.com/mailgun/mailgun-go/v4 to v4.11.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/mailgun/mailgun-go/v4	require	patch	v4.11.0 -> v4.11.1

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Release Notes

mailgun/mailgun-go (github.com/mailgun/mailgun-go/v4)

### [`v4.11.1`](https://togithub.com/mailgun/mailgun-go/releases/tag/v4.11.1) [Compare Source](https://togithub.com/mailgun/mailgun-go/compare/v4.11.0...v4.11.1) #### What's Changed - Fix resource leak from time.NewTicker by [@​SamuelSarle](https://togithub.com/SamuelSarle) in [https://github.com/mailgun/mailgun-go/pull/313](https://togithub.com/mailgun/mailgun-go/pull/313) #### New Contributors - [@​SamuelSarle](https://togithub.com/SamuelSarle) made their first contribution in [https://github.com/mailgun/mailgun-go/pull/313](https://togithub.com/mailgun/mailgun-go/pull/313) **Full Changelog**: https://github.com/mailgun/mailgun-go/compare/v4.11.0...v4.11.1

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