Adapt to bazel 9.1.0 update

Change-Id: I777bc55a3434ed94897d7e2220a5bb6c9376c823

src/main/java/com/googlesource/gerrit/plugins/renameproject/RenameProjectFilter.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/renameproject/RenameProjectFilter.java b/src/main/java/com/googlesource/gerrit/plugins/renameproject/RenameProjectFilter.java
index 649c1ac..d4f7310 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/renameproject/RenameProjectFilter.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/renameproject/RenameProjectFilter.java
@@ -149,7 +149,7 @@
         json.setLenient(true);
 
         try {
-          json.peek();
+          var unused = json.peek();
         } catch (EOFException e) {
           throw new BadRequestException("Expected JSON object", e);
         }