go away dependabot

.github/dependabot.yml

@@ -1,36 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: weekly
-    labels:
-      - "infra"
-    commit-message:
-      prefix: "ci"
-
-  - package-ecosystem: nuget
-    directory: /
-    open-pull-requests-limit: 10
-    schedule:
-      interval: daily
-    labels:
-      - "infra"
-    commit-message:
-      prefix: nuget
-    groups:
-      #Avalonia:
-        #patterns:
-          #- "*Avalonia*"
-      Silk.NET:
-        patterns:
-          - "Silk.NET*"
-      OpenTK:
-        patterns:
-          - "OpenTK*"
-      SixLabors:
-        patterns:
-          - "SixLabors*"
-      NUnit:
-        patterns:
-          - "NUnit*"