fix: switch back to package.json as it's necessary for GH actions (#101)

deno.json

@@ -12,16 +12,5 @@
   ],
   "tasks": {
     "build": "deno run -A scripts/build.ts"
-  },
-  "imports": {
-    "@actions/cache": "npm:@actions/cache@^4.0.3",
-    "@actions/core": "npm:@actions/core@^1.11.1",
-    "@actions/glob": "npm:@actions/glob@^0.5.0",
-    "@actions/tool-cache": "npm:@actions/tool-cache@^2.0.2",
-    "@types/node": "npm:@types/node@^22.15.0",
-    "@types/semver": "npm:@types/semver@^7.7.0",
-    "semver": "npm:semver@^7.7.1",
-    "tsdown": "npm:tsdown@0.10.1",
-    "undici": "npm:undici@^7.8.0"
   }
 }