Release: Bump version to 10.4.0-pre (#80412)

"Release: Updated versions in package to 10.4.0-pre"

Co-authored-by: grafana-delivery-bot[bot] <132647405+grafana-delivery-bot[bot]@users.noreply.github.com>

packages/grafana-plugin-configs/package.json

@@ -2,7 +2,7 @@
   "name": "@grafana/plugin-configs",
   "description": "Shared dependencies and files for core plugins",
   "private": true,
-  "version": "10.3.0-pre",
+  "version": "10.4.0-pre",
   "dependencies": {
     "tslib": "2.6.0"
   },