Explicitly request serde's std features to avoid issues with newer toml versions.

Update serde while at it. Fixes #1114

Author: emilio

CHANGES

@@ -1,5 +1,9 @@
 # unreleased
 
+# 0.29.2
+
+      * Request serde's std feature to avoid issues with newer toml versions.
+
 # 0.29.1
 
       * cf13c2b enum: Track dependencies properly in enumerations.

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "cbindgen"
-version = "0.29.1"
+version = "0.29.2"
 authors = [
   "Emilio Cobos Álvarez <emilio@crisal.io>",
   "Jeff Muizelaar <jmuizelaar@mozilla.com>",
@@ -22,7 +22,7 @@ exclude = [
 clap = { version = "4.3", optional = true }
 indexmap = "2.1.0"
 log = "0.4"
-serde = { version = "1.0.103", default-features = false, features = ["derive"] }
+serde = { version = "1.0.103", default-features = false, features = ["derive", "std"] }
 serde_json = "1.0"
 tempfile = "3"
 toml = { version = "0.9", default-features = false, features = ["parse", "serde", "std"] }