fix: import axios correctly

[yoitsro]

Fixes

As mentioned in axios's example, in order to use axios with types (which a lot of people are now doing), the .default import needs to be used.

This doesn't impact non-typescript based users, but means typescript users can actually use sendgrid again.

Closes #1426

Checklist

• [x] I acknowledge that all my contributions will be made under the project's license
• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the Contribution Guidelines and my PR follows them
• [x] I have titled the PR appropriately
• [x] I have updated my branch with the main branch ~- [ ] I have added tests that prove my fix is effective or that my feature works~ ~- [ ] I have added the necessary documentation about the functionality in the appropriate .md file~ ~- [ ] I have added inline documentation to the code I modified~

If you have questions, please file a support ticket.