Upgrade to GitHub-native Dependabot (#255)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

.github/dependabot.yml

@@ -0,0 +1,25 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: monthly
+    time: "04:00"
+  open-pull-requests-limit: 10
+  versioning-strategy: widen
+  ignore:
+  - dependency-name: less
+    versions:
+    - 4.0.0
+  - dependency-name: "@types/fs-extra"
+    versions:
+    - 9.0.6
+  - dependency-name: webpack-cli
+    versions:
+    - 4.3.1
+  - dependency-name: postcss
+    versions:
+    - 8.2.1
+  - dependency-name: "@types/react"
+    versions:
+    - 17.0.0