Update pre-commit.yml

.github/workflows/pre-commit.yml

@@ -1,3 +1,4 @@
+---
 # Copyright 2024 "Google LLC"
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -12,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
----
 name: 'Use pre-commit to validate Pull Request'
 
 # yamllint disable-line rule:truthy