Updates visual design of Checkbox and Radio inputs (#2701)

* updates checkbox and radio inputs to match PVC

* adds changeset

* fixes minor visual inconsistencies

* updates snapshots

* test(vrt): update snapshots

* styles the indeterminate checkbox state

Co-authored-by: mperrotti <mperrotti@users.noreply.github.com>

Author: mperrotti

.changeset/happy-needles-pump.md

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+---
+'@primer/react': patch
+---
+
+Updates visual design of the Checkbox and Radio component to match the new direction defined by design.