Make the list pure matrix

Author: aidangarske

.github/workflows/grpc.yml

@@ -74,15 +74,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - 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
+        grpc_ref: [ 'v1.60.0', '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: