chore: remove batteries dependency from ProofWidgets4 in release_repos.yml (#12535)

This PR removes the batteries dependency from ProofWidgets4 in
`release_repos.yml`. ProofWidgets4 no longer has any `require`
statements in its lakefile, so it doesn't depend on batteries.

🤖 Prepared with Claude Code

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

script/release_repos.yml

@@ -77,8 +77,7 @@ repositories:
     toolchain-tag: false
     stable-branch: false
     branch: main
-    dependencies:
-      - batteries
+    dependencies: []
 
   - name: aesop
     url: https://github.com/leanprover-community/aesop