test: end tls connection with some data

In openssl-1.1.1e the client doesn't seem to like having the TLS
connection shut down with no data sent, so send an empty string. A
number of related issues showed up in the TLS1.3 port, so this is
not entirely surprising.

PR-URL: #32328
Fixes: #32210
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-tls-session-cache.js

@@ -65,7 +65,7 @@ function doTest(testOptions, callback) {
         throw er;
     });
     ++requestCount;
-    cleartext.end();
+    cleartext.end('');
   });
   server.on('newSession', function(id, data, cb) {
     ++newSessionCount;