Revert "Give actions: write perms to TagBot (#25)"

This reverts commit 74c5f4e.

Author: DilumAluthge

.github/workflows/TagBot.yml

@@ -8,7 +8,7 @@ on:
       lookback:
         default: "3"
 permissions:
-  actions: write
+  actions: read
   checks: read
   contents: write
   deployments: read