reference @actions/attest package (#10)

Signed-off-by: Brian DeHamer <[email protected]>

package.json

@@ -25,7 +25,6 @@
   },
   "scripts": {
     "bundle": "npm run format:write && npm run package",
-    "prepackage": "npm run build --workspace packages/attest",
     "ci-test": "jest",
     "coverage": "make-coverage-badge --output-path ./badges/coverage.svg",
     "format:write": "prettier --write **/*.ts",
@@ -67,15 +66,16 @@
     ]
   },
   "dependencies": {
+    "@actions/attest": "^1.0.0",
     "@actions/core": "^1.10.1",
     "@actions/glob": "^0.4.0",
     "@sigstore/oci": "^0.1.0"
   },
   "devDependencies": {
     "@types/jest": "^29.5.12",
+    "@types/make-fetch-happen": "^10.0.4",
     "@types/node": "^20.11.17",
     "@typescript-eslint/parser": "^6.21.0",
-    "@types/make-fetch-happen": "^10.0.4",
     "@vercel/ncc": "^0.38.1",
     "eslint": "^8.56.0",
     "eslint-plugin-github": "^4.10.1",
@@ -89,8 +89,5 @@
     "prettier-eslint": "^16.3.0",
     "ts-jest": "^29.1.2",
     "typescript": "^5.3.3"
-  },
-  "workspaces": [
-    "./packages/*"
-  ]
+  }
 }