removed once_cell as dependency from rustc_codegen_nvvm. The goal was to replace with the standardized version from the std library, but the dependency does not seem to be in use anyway

Author: Schmiedium

crates/rustc_codegen_nvvm/Cargo.toml

@@ -19,7 +19,6 @@ nvvm = { version = "0.1", path = "../nvvm" }
 rustc-demangle = "0.1.24"
 libc = "0.2.169"
 tar = "0.4.43"
-once_cell = "1.8.0" # this can be replaced wit std::cell implementation 
 bitflags = "2.8"
 tracing = { version = "0.1.41", features = ["release_max_level_debug"] }
 find_cuda_helper = { version = "0.2", path = "../find_cuda_helper" }