Update dependabot config

Author: asvetlov

.github/dependabot.yml

@@ -5,22 +5,9 @@ updates:
   schedule:
     interval: daily
   open-pull-requests-limit: 10
-  ignore:
-  - dependency-name: docutils
-    versions:
-    - "0.17"
-  - dependency-name: flake8
-    versions:
-    - 3.9.0
-  - dependency-name: tox
-    versions:
-    - 3.21.3
-    - 3.21.4
-    - 3.22.0
-  - dependency-name: pygments
-    versions:
-    - 2.7.4
-    - 2.8.0
-  - dependency-name: pytest
-    versions:
-    - 6.2.2
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: daily
+    time: "03:00"
+  open-pull-requests-limit: 10