internal: unpin serde

Sered no longer uses blobs as of

serde-rs/serde#2590

As such, there's no longer need for us to pin it.

Note that this doesn't upgrade serde version we use: I am fairly
confident that the blobs are already there are fine, and now I am fairly
confident that all future versions of serde will be fine as well.

Cargo.toml

@@ -97,8 +97,7 @@ smallvec = { version = "1.10.0", features = [
 smol_str = "0.2.0"
 nohash-hasher = "0.2.0"
 text-size = "1.1.0"
-# See https://github.com/serde-rs/serde/issues/2538#issuecomment-1684517372 for why we pin serde
-serde = { version = "1.0.156, < 1.0.172", features = ["derive"] }
+serde = { version = "1.0.156", features = ["derive"] }
 serde_json = "1.0.96"
 triomphe = { version = "0.1.8", default-features = false, features = ["std"] }
 # can't upgrade due to dashmap depending on 0.12.3 currently

lib/lsp-server/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lsp-server"
-version = "0.7.3"
+version = "0.7.4"
 description = "Generic LSP server scaffold."
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/rust-analyzer/tree/master/lib/lsp-server"
@@ -9,8 +9,7 @@ edition = "2021"
 [dependencies]
 log = "0.4.17"
 serde_json = "1.0.96"
-# See https://github.com/serde-rs/serde/issues/2538#issuecomment-1684517372 for why we pin serde
-serde = { version = "1.0.156, < 1.0.172", features = ["derive"] }
+serde = { version = "1.0.156", features = ["derive"] }
 crossbeam-channel = "0.5.6"
 
 [dev-dependencies]