Switch Prettier endOfLine to "auto" (#5545) (#5547)

This is in line with `.gitattributes`, and should give a more pleasant experience on Windows.

(cherry picked from commit c0b5fc1)

Co-authored-by: Quentin Pradet <quentin.pradet@elastic.co>

Author: github-actions[bot]

compiler/.prettierrc.json

@@ -6,6 +6,6 @@
   "singleQuote": true,
   "quoteProps": "as-needed",
   "bracketSpacing": true,
-  "endOfLine": "lf",
+  "endOfLine": "auto",
   "bracketSameLine": true
 }