github ci perms

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1903173 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 7687c75..70e4dfc 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -13,3 +13,5 @@
     directory: "/"
     schedule:
       interval: "daily"
+
+permissions: {}