ci: update GitHub token secret name

Update the GitHub token secret name from GITHUB_TOKEN to RTOKEN in the GitHub Actions workflow for creating and uploading releases. This change ensures that the correct token is used for authentication during the release process.

.github/workflows/go.yml

@@ -66,7 +66,7 @@ jobs:
       if: startsWith(github.ref, 'refs/tags/')
       uses: actions/create-release@v1
       env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        GITHUB_TOKEN: ${{ secrets.RTOKEN }}
       with:
         tag_name: ${{ github.ref_name }}
         release_name: Release ${{ github.ref_name }}
@@ -78,7 +78,7 @@ jobs:
       if: startsWith(github.ref, 'refs/tags/')
       uses: actions/upload-release-asset@v1
       env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        GITHUB_TOKEN: ${{ secrets.RTOKEN }}
       with:
         upload_url: ${{ steps.create_release.outputs.upload_url }}
         asset_path: ./${{ matrix.output }}