revert: github ci perms

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1903174 13f79535-47bb-0310-9956-ffa450edef68

.github/dependabot.yml

@@ -13,5 +13,3 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
-
-permissions: {}