Revert webhook tstl auto update and use dependabot instead

Author: lolleko

.github/dependatbot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    allow:
+      - dependency-name: "typescript-to-lua"