test: use lower security level in s_client

With the default security level (SECLEVEL=2), the following error

```
40E72B52DB7F0000:error:0A00018A:SSL routines:tls_process_ske_dhe:dh key
too small:../deps/openssl/openssl/ssl/statem/statem_clnt.c:2100
```

is raised on on Ubuntu 22.04 on WSL2.

PR-URL: #48192
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-tls-dhe.js

@@ -65,7 +65,7 @@ function test(dhparam, keylen, expectedCipher) {
 
   server.listen(0, '127.0.0.1', common.mustCall(() => {
     const args = ['s_client', '-connect', `127.0.0.1:${server.address().port}`,
-                  '-cipher', ciphers];
+                  '-cipher', `${ciphers}:@SECLEVEL=1`];
 
     execFile(common.opensslCli, args, common.mustSucceed((stdout) => {
       assert(keylen === null ||