syntax: release 0.6.9

Author: BurntSushi

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "regex-syntax"
-version = "0.6.8"  #:version
+version = "0.6.9"  #:version
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rust-lang/regex"
@@ -10,4 +10,4 @@ description = "A regular expression parser."
 workspace = ".."
 
 [dependencies]
-ucd-util = "0.1.0"
+ucd-util = "0.1.4"