Add npm dependabot (#3210)

Like mentioned
[there](#3207 (comment))

I open an PR with npm dependabot (every monthly)

It might be interesting to have an overview every month

---------

Co-authored-by: Veeck <github@veeck.de>

.github/dependabot.yaml

@@ -5,3 +5,9 @@ updates:
     schedule:
       interval: "weekly"
     target-branch: "develop"
+
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    target-branch: "develop"

CHANGELOG.md

@@ -22,6 +22,7 @@ _This release is scheduled to be released on 2023-10-01._
 - Added automatic client page reload when server was restarted by setting `reloadAfterServerRestart: true` in `config.js`, per default `false` (#3105)
 - Added eventClass option for customEvents on the default calendar
 - Added AnimateCSS integration in tests suite (#3206)
+- Added npm dependabot [Reserved to developer] (#3210)
 - Added improved logging for calendar (#3110)
 
 ### Removed