Bump to toml 0.9.11 for TOML 1.1.0 support

See the CHANGELOG; there's actually a good bit of new syntax supported
in this release, to the point that it's probably time for me to ship
xt v0.20.0.

Author: featherbread

CHANGELOG.md

@@ -1,5 +1,12 @@
 ## Unreleased
 
+### Added
+
+- **TOML 1.1 support.** This version of xt upgrades to the latest version of
+  the third-party `toml` library, which supports new features from the recently
+  released TOML 1.1.0 spec: trailing commas in inline tables, optional seconds
+  in datetime values, and more.
+
 ### Changed
 
 - **Rust 1.85 or higher is required to build xt.** This change enables continued

Cargo.lock

@@ -24,7 +24,7 @@ serde_yaml = "0.9.34"
 unsafe-libyaml = "0.2.11"
 
 [dependencies.toml]
-version = "0.9.5"
+version = "0.9.11"
 features = ["preserve_order"]
 
 [target.'cfg(unix)'.dependencies]