Bump v6 branch to using latest alphas before alpha release

[nicolethoen]

This will require PF dependencies to be updated in

• documentation-framework
• documentation-site

Then, after an alpha release is published of the documentation framework (which includes the table work):

• bump the docs-framework dependency in the design-tokens repo (so the table in that documentation isn't broken)
• pull in the updated design-tokens docs to the org/documentation-site package

[nicolethoen]

Closed by #3931