chore(percy): use proper auth token in CI (#10821)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
Co-authored-by: Josh Black <[email protected]>

.github/workflows/ci.yml

@@ -129,6 +129,6 @@ jobs:
         run: yarn build --ignore '@carbon/sketch'
       - name: Run VRT
         env:
-          PERCY_TOKEN: dd3392142006a6483c8f524697f39f052755fa9dc087ff4437cac3d64227abdd
+          PERCY_TOKEN: ${{ secrets.PERCY_TOKEN }}
         run: |
           yarn run percy exec -- yarn workspace carbon-components-react test:e2e