Fix another subpath

Signed-off-by: William Woodruff <william@yossarian.net>

Author: woodruffw

.github/workflows/documentation-links.yml

@@ -22,7 +22,7 @@ jobs:
     timeout-minutes: 5
 
     steps:
-      - uses: readthedocs/actions@b8bba1484329bda1a3abe986df7ebc80a8950333 # v1.5
+      - uses: readthedocs/actions/preview@b8bba1484329bda1a3abe986df7ebc80a8950333 # v1.5
         with:
           project-slug: "cpython-previews"
           single-version: "true"