Bump roxmltree public depedency and hence our own version.

Author: adamreichold

Cargo.toml

@@ -8,12 +8,12 @@ license = "MIT OR Apache-2.0"
 repository = "https://github.com/adamreichold/serde-roxmltree"
 documentation = "https://docs.rs/serde-roxmltree"
 readme = "README.md"
-version = "0.9.2"
+version = "0.10.0"
 edition = "2021"
 
 [dependencies]
 bit-set = "0.8"
-roxmltree = { version = "0.20", default-features = false, features = ["std"] }
+roxmltree = { version = "0.21", default-features = false, features = ["std"] }
 serde_core = "1.0"
 
 [dev-dependencies]