.github: fix missed workflow update to rollkit/.github repo (cosmos#997)

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Looks like one line was missed in a merge conflict or something. 
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.github/workflows/housekeeping.yml

@@ -25,7 +25,7 @@ jobs:
     # ignore dependabot PRs
     if: ${{ github.event.pull_request && github.actor != 'dependabot[bot]' }}
     name: Add PRs to project
-    uses: celestiaorg/.github/.github/workflows/[email protected]
+    uses: rollkit/.github/.github/workflows/[email protected]
     secrets: inherit
     permissions:
       issues: write