docs: 6.8.0 changelog (#3718)
docs: 6.8.0 changelog (#3718)

Co-authored-by: Chris Breiding <1f056232f77f694a4096f4fb65deaeed71c343ef@users.noreply.github.com>
Co-authored-by: Jennifer Shehane <e3cd9f6469fc3e1acfb9f2bdbfc5a3d2bbb8e2ad@cypress.io>
cypress-io/cypress-documentation,cypress-io/cypress-documentation