bump @actions/attest from 1.1.0 to 1.2.1 (#41)

Signed-off-by: Brian DeHamer <bdehamer@github.com>

package.json

@@ -69,7 +69,7 @@
     ]
   },
   "dependencies": {
-    "@actions/attest": "^1.1.0",
+    "@actions/attest": "^1.2.1",
     "@actions/core": "^1.10.1",
     "@actions/glob": "^0.4.0",
     "@sigstore/oci": "^0.3.0"
@@ -94,6 +94,7 @@
     "prettier": "^3.2.5",
     "prettier-eslint": "^16.3.0",
     "ts-jest": "^29.1.2",
-    "typescript": "^5.4.5"
+    "typescript": "^5.4.5",
+    "undici": "^5.28.4"
   }
 }