ci: add dependabot (#335)

.github/dependabot.yml

@@ -0,0 +1,13 @@
+# See config in https://docs.github.com/en/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  # Enable version updates for npm
+  - package-ecosystem: 'npm'
+    # Look for `package.json` and `lock` files in the `root` directory
+    directory: '/'
+    # Check the npm registry for updates every day (weekdays)
+    schedule:
+      interval: 'weekly'
+    # Always increase the version in package.json as well (for patch versions by default only package-lock.json i updated)
+    versioning-strategy: increase