revert version of tree-sitter as generated binding doesn't compile

Author: SteveL-MSFT

dsc_lib/Cargo.toml

@@ -17,7 +17,7 @@ serde_yaml = { version = "0.9.3" }
 thiserror = "1.0"
 chrono = "0.4.26"
 tracing = "0.1.37"
-tree-sitter = "0.21"
+tree-sitter = "0.20"
 tree-sitter-dscexpression = { path = "../tree-sitter-dscexpression" }
 
 [dev-dependencies]

dsc_lib/src/parser/mod.rs

@@ -24,7 +24,7 @@ impl Statement {
     /// This function will return an error if the underlying parser fails to initialize.
     pub fn new() -> Result<Self, DscError> {
         let mut parser = Parser::new();
-        parser.set_language(&tree_sitter_dscexpression::language())?;
+        parser.set_language(tree_sitter_dscexpression::language())?;
         let function_dispatcher = FunctionDispatcher::new();
         Ok(Self {
             parser,

tree-sitter-dscexpression/Cargo.toml

@@ -20,7 +20,7 @@ include = [
 path = "bindings/rust/lib.rs"
 
 [dependencies]
-tree-sitter = "0.21"
+tree-sitter = "0.20"
 
 [build-dependencies]
 cc = "1.0"