Migrate "torchrecipes/utils" from LLVM-12 to LLVM-15

Summary:
fbcode is migrating to LLVM-15 for safer and more up-to-date code and new compiler features. All contbuilds in your directory have passed our build test with LLVM-15, and your directory does not house any packages. This diff will migrate it to LLVM-15.

If you approve of this diff, please use the "Accept & Ship" button. If you have a blocker on building with LLVM 15, please comment on this diff. All fbcode directories will move to LLVM 15, so please start working on the fixes, testing and canary ASAP. If all tests are green, we will land this on Friday 06/23/2023.

See the [FAQ post](https://fb.workplace.com/groups/llvm15platform010/posts/749154386769776/)! Please also direct any questions to [this group](https://fb.workplace.com/groups/llvm15platform010).

 - If you approve of this diff, please use the "Accept & Ship" button :-)

Build directives:

Reviewed By: r-barnes

Differential Revision: D46921904

fbshipit-source-id: c78ed92b8045e5863593bad611ee6643874c91e9

torchrecipes/utils/PACKAGE

@@ -0,0 +1,3 @@
+load("@fbcode_macros//build_defs:package_local_utils.bzl", "package_local_utils")
+
+package_local_utils.set_clang_version(15, True)