Add cypress 7.0 to peer dependencies

[juliankrispel]

What:

Adding 7.0 to peer deps

Why:

To resolve the peer dependency warning:

How:

Update package.json

Checklist:

• [x] Documentation
• [x] Tests
• [x] Ready to be merged

[leschdom]

Looks like a duplicate of https://github.com/testing-library/cypress-testing-library/pull/182 (which is also pending merge)

[juliankrispel]

Looks like a duplicate of #182 (which is also pending merge)

whoops thanks