Upgrade to GitHub-native Dependabot (#239)

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

.github/dependabot.yml

@@ -0,0 +1,23 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: karma
+    versions:
+    - 6.0.0
+    - 6.1.0
+    - 6.1.2
+    - 6.2.0
+  - dependency-name: semver
+    versions:
+    - 7.3.4
+  - dependency-name: style-loader
+    versions:
+    - 1.2.1
+  - dependency-name: express-validator
+    versions:
+    - 6.9.2