[libcxxabi] Update demangle/Utility.h

4eed68357e4361b3a3aeb349dec2612cfb74c8cc updated the LLVM side but did
not bump the libc++abi version. Bump the libc++abi version to fix the
test failure caused by the versions differing.

GitOrigin-RevId: c946b96d9bca595888535bcc0499fc1ea6a42192
diff --git a/src/demangle/Utility.h b/src/demangle/Utility.h
index 8829f3f..76243f5 100644
--- a/src/demangle/Utility.h
+++ b/src/demangle/Utility.h
@@ -81,7 +81,7 @@
   OutputBuffer(const OutputBuffer &) = delete;
   OutputBuffer &operator=(const OutputBuffer &) = delete;
 
-  virtual ~OutputBuffer() {}
+  virtual ~OutputBuffer() = default;
 
   operator std::string_view() const {
     return std::string_view(Buffer, CurrentPosition);