bump @iobroker/adapter-core from 2.6.8 to 3.0.4

---
updated-dependencies:
- dependency-name: "@iobroker/adapter-core"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -39,7 +39,7 @@
     "node-red-node-feedparser": "^0.3.0",
     "node-red-node-sentiment": "^0.1.6",
     "node-red-node-twitter": "^1.2.0",
-    "@iobroker/adapter-core": "^2.6.8"
+    "@iobroker/adapter-core": "^3.0.4"
   },
   "devDependencies": {
     "@alcalzone/release-script": "^3.6.0",