Upgrade to GitHub-native Dependabot (#145)

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

Author: dependabot-preview[bot]

.github/dependabot.yml

@@ -0,0 +1,29 @@
+version: 2
+updates:
+- package-ecosystem: composer
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: phpstan/phpstan
+    versions:
+    - 0.12.70
+    - 0.12.71
+    - 0.12.73
+    - 0.12.74
+    - 0.12.75
+    - 0.12.76
+    - 0.12.77
+    - 0.12.78
+    - 0.12.79
+    - 0.12.80
+    - 0.12.81
+    - 0.12.82
+    - 0.12.83
+  - dependency-name: phpunit/phpunit
+    versions:
+    - 9.5.1
+    - 9.5.2
+    - 9.5.3
+    - 9.5.4