tools: update ESLint to 7.25.0

Update ESLint to 7.25.0

PR-URL: #38378
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-tls-transport-destroy-after-own-gc.js

@@ -15,12 +15,12 @@ const makeDuplexPair = require('../common/duplexpair');
 let { clientSide } = makeDuplexPair();
 
 let clientTLS = new TLSSocket(clientSide, { isServer: false });
-let clientTLSHandle = clientTLS._handle;
+let clientTLSHandle = clientTLS._handle;  // eslint-disable-line no-unused-vars
 
 setImmediate(() => {
   clientTLS = null;
   global.gc();
-  clientTLSHandle = null; // eslint-disable-line no-unused-vars
+  clientTLSHandle = null;
   global.gc();
   setImmediate(() => {
     clientSide = null;