chore(CI): Add lukesandberg to turbopack team (#78074)

Verified over slack that this is the correct username.

Author: bgw

.github/labeler.json

@@ -51,6 +51,7 @@
       { "type": "user", "pattern": "bgw" },
       { "type": "user", "pattern": "Cy-Tek" },
       { "type": "user", "pattern": "kdy1" },
+      { "type": "user", "pattern": "lukesandberg" },
       { "type": "user", "pattern": "mischnic" },
       { "type": "user", "pattern": "padmaia" },
       { "type": "user", "pattern": "sokra" },