Increase timeout for C/C++ MacOS builds (#37224)

Closes #37224

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37224 from yashykt:IncreaseMacOSTimeout b12d19d14b
PiperOrigin-RevId: 652657690

tools/internal_ci/macos/grpc_basictests_c_cpp_dbg.cfg

@@ -17,7 +17,7 @@
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_run_tests_matrix.sh"
 gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
-timeout_mins: 240
+timeout_mins: 360
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"

tools/internal_ci/macos/grpc_basictests_c_cpp_opt.cfg

@@ -17,7 +17,7 @@
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_run_tests_matrix.sh"
 gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
-timeout_mins: 240
+timeout_mins: 360
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"

tools/internal_ci/macos/pull_request/grpc_basictests_c_cpp_dbg.cfg

@@ -17,7 +17,7 @@
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_run_tests_matrix.sh"
 gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
-timeout_mins: 180
+timeout_mins: 360
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"