Fix grpc ref format

Author: aidangarske

.github/workflows/grpc.yml

@@ -75,13 +75,14 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - grpc_ref: [ 'master', 'v1.60.0' ]
-            tests: >-
-              bad_ssl_alpn_test bad_ssl_cert_test client_ssl_test
-              crl_ssl_transport_security_test server_ssl_test
-              ssl_transport_security_test ssl_transport_security_utils_test
-              test_core_security_ssl_credentials_test test_cpp_end2end_ssl_credentials_test
-              h2_ssl_cert_test h2_ssl_session_reuse_test
+          - grpc_ref: 'v1.60.0'
+          - grpc_ref: 'master'
+        tests: >-
+          bad_ssl_alpn_test bad_ssl_cert_test client_ssl_test
+          crl_ssl_transport_security_test server_ssl_test
+          ssl_transport_security_test ssl_transport_security_utils_test
+          test_core_security_ssl_credentials_test test_cpp_end2end_ssl_credentials_test
+          h2_ssl_cert_test h2_ssl_session_reuse_test
         wolfssl_ref: [ 'master', 'v5.7.4-stable' ]
         openssl_ref: [ 'openssl-3.2.0' ]
     steps: