fix: we cannot pprof in windows (#74)

`pprof` is a "unix" only dependency. Even though we do not "use" it
anywhere not protected by `cfg!`, it seems as though `cargo test` builds
all dependencies, which `pprof` fails.

Fix is simple, simply only include that dep on `unix` systems. Confirmed
testing/building on my Windows machine.

closes: #66

crates/hdx_lsp/Cargo.toml

@@ -38,11 +38,13 @@ tracing-subscriber = { workspace = true }
 [dev-dependencies]
 glob = { workspace = true }
 criterion = { workspace = true, features = ["html_reports"] }
-pprof = { workspace = true, features = ["flamegraph", "criterion"] }
 insta = { workspace = true, features = ["json"] }
 similar = { workspace = true }
 console = { workspace = true }
 
+[target.'cfg(target_family = "unix")'.dev-dependencies]
+pprof = { workspace = true, features = ["flamegraph", "criterion"] }
+
 [features]
 default = []
 fancy = ["miette/fancy-no-backtrace"]