Fix publication of wasmtime-wasi-threads for the future

Semi-backport of bytecodealliance#8986 to remove invalid categories of the
`wasmtime-wasi-threads` crate that aren't present on crates.io.

crates/wasi-threads/Cargo.toml

@@ -5,7 +5,7 @@ authors.workspace = true
 description = "Wasmtime implementation of the wasi-threads API"
 documentation = "https://docs.rs/wasmtime-wasi-nn"
 license = "Apache-2.0 WITH LLVM-exception"
-categories = ["wasm", "parallelism", "threads"]
+categories = ["wasm"]
 keywords = ["webassembly", "wasm", "neural-network"]
 repository = "https://github.com/bytecodealliance/wasmtime"
 readme = "README.md"