Revert "Update dependabot.yml"

This reverts commit 504274e. It's not
the correct fix for this. See https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#ignore

Author: khatchad

.github/dependabot.yml

@@ -11,5 +11,3 @@ updates:
       interval: "weekly"
     ignore:
       - dependency-name: "tensorflow*"
-      - update-types: "all"
-      - versions: "*"