[upstream_utils] Remove extra protobuf patch (#8181)

Missed in the rebase for #7988

upstream_utils/protobuf_patches/0015-Ignore-GCC-15-warning.patch

@@ -1,24 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: iris <snazzsinclair@gmail.com>
-Date: Thu, 7 Aug 2025 15:02:46 -0500
-Subject: [PATCH 15/15] Ignore GCC 15 warning
-
----
- src/google/protobuf/generated_message_tctable_lite.cc | 4 ++++
- 1 file changed, 4 insertions(+)
-
-diff --git a/src/google/protobuf/generated_message_tctable_lite.cc b/src/google/protobuf/generated_message_tctable_lite.cc
-index 23557a614752a9f0c93d8bd56724f3bc0f962185..ddb29cbddac62914b42e26d1758bb31e7e0d9204 100644
---- a/src/google/protobuf/generated_message_tctable_lite.cc
-+++ b/src/google/protobuf/generated_message_tctable_lite.cc
-@@ -47,6 +47,10 @@
- #pragma GCC diagnostic ignored "-Wunused-function"
- #endif
- 
-+#if __GNUC__ >= 15
-+#pragma GCC diagnostic ignored "-Wmaybe-musttail-local-addr"
-+#endif
-+
- namespace google {
- namespace protobuf {
- namespace internal {