fix: Replace deprecated Buffer with Buffer.from

src/closure-compiler-plugin.js

@@ -1048,7 +1048,7 @@ class ClosureCompilerPlugin {
       // Ignore errors (EPIPE) if the compiler input stream is closed
       compilerProcess.stdin.on('error', (err) => {});
 
-      const buffer = new Buffer(JSON.stringify(sources), 'utf8');
+      const buffer = Buffer.from(JSON.stringify(sources), 'utf8');
       const readable = new Readable();
       readable._read = () => {};
       readable.push(buffer);