fix(deps): update dependency @nextcloud/auth to ^2.6.0 (#814)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -8,7 +8,7 @@
     "lib": "lib"
   },
   "dependencies": {
-    "@nextcloud/auth": "^2.5.3",
+    "@nextcloud/auth": "^2.6.0",
     "@nextcloud/initial-state": "^3.0.0",
     "@nextcloud/logger": "^3.0.3",
     "@sentry/browser": "^10.46.0"