remove custom pin-name and use default

Author: 2color

.github/workflows/build.yml

@@ -60,7 +60,6 @@ jobs:
           storacha-proof: ${{ secrets.STORACHA_PROOF }}
           #TODO pinata-jwt-token: ${{ secrets.PINATA_JWT_TOKEN }}
           github-token: ${{ github.token }}
-          pin-name: 'specs.ipfs.tech-${{ github.sha }}'
 
       - name: Update DNSLink
         if: false # TODO github.ref == 'refs/heads/main' # only update DNSLink for main branch