Update @iobroker/adapter-core requirement from ^2.6.7 to ^2.6.8

Updates the requirements on [@iobroker/adapter-core](https://github.com/ioBroker/adapter-core) to permit the latest version.
- [Release notes](https://github.com/ioBroker/adapter-core/releases)
- [Commits](ioBroker/adapter-core@v2.6.7...v2.6.8)

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

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -30,7 +30,7 @@
     "@types/node": "should match the lowest MAJOR version of Node.js we support."
   },
   "dependencies": {
-    "@iobroker/adapter-core": "^2.6.7",
+    "@iobroker/adapter-core": "^2.6.8",
     "@types/node": "^18.15.11",
     "@types/request": "^2.48.8",
     "axios": "^1.3.4",