[CI] Set up CI for Mac M1 (#9699)

tests/cpp/collective/test_allreduce.cc

@@ -53,7 +53,7 @@ class AllreduceWorker : public WorkerForTest {
     Context ctx;
     std::vector<std::uint32_t> data(comm_.World(), 0);
     data[comm_.Rank()] = ~std::uint32_t{0};
-    auto pcoll = std::make_shared<Coll>();
+    auto pcoll = std::shared_ptr<Coll>{new Coll{}};
     auto rc = pcoll->Allreduce(&ctx, comm_, EraseType(common::Span{data.data(), data.size()}),
                                ArrayInterfaceHandler::kU4, Op::kBitwiseOR);
     ASSERT_TRUE(rc.OK()) << rc.Report();

tests/cpp/collective/test_loop.cc

@@ -41,7 +41,7 @@ class LoopTest : public ::testing::Test {
     rc = pair_.first.NonBlocking(true);
     ASSERT_TRUE(rc.OK());
 
-    loop_ = std::make_shared<Loop>(timeout);
+    loop_ = std::shared_ptr<Loop>{new Loop{timeout}};
   }
 
   void TearDown() override {