feat: support mp4 files by default

[abramenal]

Checklist:

• [ ] No linting issues
• [ ] Commits are compliant with commitizen
• [ ] CI tests have passed
• [ ] Documentation updated

Linked issues

Closes #322

[cypress[bot]]

---

Test summary

39 • 0 • 0 • 0

---

Run details

Project	cypress-file-upload
Status	Passed
Commit	ea6d1f8cb3 ℹ️
Started	Oct 24, 2021 7:46 PM
Ended	Oct 24, 2021 7:48 PM
Duration	01:42 💡
OS	Linux Debian - 10.6
Browser	Chrome 86

View run in Cypress Dashboard ➡️

---

This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard