Upgrade to GitHub-native Dependabot (openapi-ts#578)

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

Author: dependabot-preview[bot]

.dependabot/config.yml

@@ -0,0 +1,36 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "12:00"
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: "@typescript-eslint/eslint-plugin"
+    versions:
+    - 4.15.0
+    - 4.15.1
+    - 4.15.2
+  - dependency-name: "@typescript-eslint/parser"
+    versions:
+    - 4.14.2
+    - 4.15.0
+    - 4.15.1
+    - 4.15.2
+  - dependency-name: eslint-config-prettier
+    versions:
+    - 8.0.0
+  - dependency-name: eslint
+    versions:
+    - 7.20.0
+  - dependency-name: typescript
+    versions:
+    - 4.1.4
+    - 4.1.5
+  - dependency-name: ts-jest
+    versions:
+    - 26.5.1
+  - dependency-name: "@types/prettier"
+    versions:
+    - 2.2.0