Fix number of TLS version tests to run.

test/core/tsi/ssl_transport_security_test.cc

@@ -969,7 +969,7 @@ void ssl_tsi_test_extract_cert_chain() {
 int main(int argc, char** argv) {
   grpc::testing::TestEnvironment env(argc, argv);
   grpc_init();
-  const size_t number_tls_versions = 2;
+  const size_t number_tls_versions = 1;
   const tsi_tls_version tls_versions[] = {tsi_tls_version::TSI_TLS1_2};
   for (size_t i = 0; i < number_tls_versions; i++) {
     // Set the TLS version to be used in the tests.