GH-35089: [CI][C++][Flight] Test failures in macos release verification nightlies (#35090)

* Closes: #35089

Authored-by: Matt Topol <zotthewizard@gmail.com>
Signed-off-by: Matthew Topol <zotthewizard@gmail.com>

Author: zeroshade

ci/conda_env_cpp.txt

@@ -27,7 +27,7 @@ gflags
 glog
 gmock>=1.10.0
 google-cloud-cpp>=1.34.0
-grpc-cpp
+grpc-cpp<=1.50.1
 gtest>=1.10.0
 libprotobuf
 libutf8proc

cpp/src/arrow/flight/flight_test.cc

@@ -1023,7 +1023,7 @@ TEST_F(TestFlightClient, TimeoutFires) {
   Status status = client->GetFlightInfo(options, FlightDescriptor{}).status();
   auto end = std::chrono::system_clock::now();
 #ifdef ARROW_WITH_TIMING_TESTS
-  EXPECT_LE(end - start, std::chrono::milliseconds{400});
+  EXPECT_LE(end - start, std::chrono::milliseconds{1200});
 #else
   ARROW_UNUSED(end - start);
 #endif

cpp/src/arrow/flight/test_definitions.cc

@@ -108,7 +108,11 @@ void ConnectivityTest::TestBrokenConnection() {
   ASSERT_OK(server->Shutdown());
   ASSERT_OK(server->Wait());
 
-  ASSERT_RAISES(IOError, client->GetFlightInfo(FlightDescriptor::Command("")));
+  auto status = client->GetFlightInfo(FlightDescriptor::Command(""));
+  ASSERT_NOT_OK(status);
+  ASSERT_THAT(
+      status.status().code(),
+      ::testing::AnyOf(::arrow::StatusCode::IOError, ::arrow::StatusCode::UnknownError));
 }
 
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