Update llvm for string changes (#4894)

This is primarily to get commits involved in
https://github.com/llvm/llvm-project/pull/120534

MODULE.bazel

@@ -116,8 +116,8 @@ bazel_dep(name = "zstd", version = "1.5.6", repo_name = "llvm_zstd")
 
 # We pin to specific upstream commits and try to track top-of-tree reasonably
 # closely rather than pinning to a specific release.
-# HEAD as of 2025-02-03.
-llvm_project_version = "6dfe20dbbd65e2945350ed9a93eb383131c49511"
+# HEAD as of 2025-02-04.
+llvm_project_version = "724fde34a5e9ae36c687a6bfbd3a50af805a62d6"
 
 # Load a repository for the raw llvm-project, pre-overlay.
 http_archive(
@@ -129,7 +129,7 @@ http_archive(
         "@carbon//bazel/llvm_project:0002_Added_Bazel_build_for_compiler_rt_fuzzer.patch",
         "@carbon//bazel/llvm_project:0003_Comment_out_unloaded_proto_library_dependencies.patch",
     ],
-    sha256 = "dde3c121ca80e9dfe06c6edf46733f559f90014919e2d30a47541267a6875af7",
+    sha256 = "5d7095e383b4d518d8079a00986b0452528fd3973c6b34b30024c3d3f68d2953",
     strip_prefix = "llvm-project-{0}".format(llvm_project_version),
     urls = ["https://github.com/llvm/llvm-project/archive/{0}.tar.gz".format(llvm_project_version)],
 )