Refactor: drop all Bun.write usage

Build/trim-source.ts

@@ -1,4 +1,5 @@
 import path from 'path';
+import fsp from 'fs/promises';
 import { fdir as Fdir } from 'fdir';
 import { readFileByLine } from './lib/fetch-text-by-line';
 
@@ -43,5 +44,5 @@ async function trimFileLines(file: string) {
     result += line.trim() + '\n';
   }
 
-  return Bun.write(file, result);
+  return fsp.writeFile(file, result);
 }