chore(deps): update dependency tree-sitter-c-sharp to v0.21.2

Author: renovate[bot]

package.json

@@ -79,7 +79,7 @@
   },
   "optionalDependencies": {
     "tree-sitter": "0.20.6",
-    "tree-sitter-c-sharp": "0.20.0",
+    "tree-sitter-c-sharp": "0.21.2",
     "tree-sitter-cli": "0.20.8",
     "tree-sitter-go": "0.20.0",
     "tree-sitter-java": "0.20.2",