Recognize pixi.lock as YAML (#35747)

Release Notes:

- N/A

crates/languages/src/yaml/config.toml

@@ -1,6 +1,6 @@
 name = "YAML"
 grammar = "yaml"
-path_suffixes = ["yml", "yaml"]
+path_suffixes = ["yml", "yaml", "pixi.lock"]
 line_comments = ["# "]
 autoclose_before = ",]}"
 brackets = [