remove dependabot

.github/dependabot.yml

@@ -1,24 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: github-actions
-    directory: /
-    schedule:
-      interval: monthly
-    ignore:
-      # slsa depends on upload/download v3
-      - dependency-name: actions/upload-artifact
-        versions: '>= 4'
-      - dependency-name: actions/download-artifact
-        versions: '>= 4'
-    groups:
-      github-actions:
-        patterns:
-          - '*'
-  - package-ecosystem: pip
-    directory: /requirements/
-    schedule:
-      interval: monthly
-    groups:
-      python-requirements:
-        patterns:
-          - '*'