ci: request-reviewers: use generated token (nix-community#1848)

Fixes: b4e1daa ("ci: request subsystem maintainers review (nix-community#1053)")
Link: nix-community#1848

Reviewed-by: Daniel Thwaites <[email protected]>

Author: trueNAHO

.github/workflows/request-reviewers.yml

@@ -78,5 +78,5 @@ jobs:
 
       - uses: AveryCameronUofR/[email protected]
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ steps.app-token.outputs.token }}
           reviewers: ${{ steps.get-reviewers.outputs.reviewers }}