Upgrade to GitHub-native Dependabot (#658)

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

Author: dependabot-preview[bot]

.github/dependabot.yml

@@ -0,0 +1,20 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: monthly
+  open-pull-requests-limit: 10
+  reviewers:
+  - Ffloriel
+  ignore:
+  - dependency-name: commander
+    versions:
+    - 7.0.0
+    - 7.1.0
+  - dependency-name: eslint
+    versions:
+    - 7.21.0
+  - dependency-name: "@typescript-eslint/parser"
+    versions:
+    - 4.14.1