build: dependabot removed for beta + check for rxjs update

Author: PVermeer

.github/dependabot.yml

@@ -9,18 +9,7 @@ updates:
       prefix: "build"
     allow:
       - dependency-type: production
-    ignore:
-      - dependency-name: "tslib"
-
-  # Still need to copy the above for the beta branch
-  - package-ecosystem: "npm"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-    target-branch: beta
-    commit-message:
-      prefix: "build"
-    allow:
-      - dependency-type: production
+      - dependency-name: "rxjs"
+        dependency-type: "development"
     ignore:
       - dependency-name: "tslib"