Rollup merge of rust-lang#157418 - kjetilkjeka:nvptx-target-maintainer-kulst, r=ZuseZ4

NVPTX: Add @kulst to the target maintainers

@kulst is joining me as a `nvptx64-nvidia-cuda` target maintainer 🎆

r? @ZuseZ4

Author: JonathanBrouwer

src/doc/rustc/src/platform-support/nvptx64-nvidia-cuda.md

@@ -8,6 +8,7 @@ platform.
 ## Target maintainers
 
 [@kjetilkjeka](https://github.com/kjetilkjeka)
+[@kulst](https://github.com/kulst)
 
 ## Requirements