Part of Ubuntu22 build fix

Summary:
Currently Ubuntu22 is failing due to submodule. But before that, there was a failure

```
In file included from /home/runner/work/CacheLib/CacheLib/cachelib/allocator/tests/ChainedHashTest.cpp:18:
/home/runner/work/CacheLib/CacheLib/cachelib/../cachelib/allocator/tests/AccessTypeTest.h: In member function ‘void facebook::cachelib::tests::AccessTypeTest<AccessType>::testIteratorMayContainNull()’:
/home/runner/work/CacheLib/CacheLib/cachelib/../cachelib/allocator/tests/AccessTypeTest.h:596:49: error: need ‘typename’ before ‘facebook::cachelib::tests::AccessTypeTest<AccessType>::Node::Handle’ because ‘facebook::cachelib::tests::AccessTypeTest<AccessType>::Node’ is a dependent scope
  596 |               [&keyToReturnNull](Node* node) -> Node::Handle {
      |                                                 ^~~~
      |                                                 typename
/home/runner/work/CacheLib/CacheLib/cachelib/../cachelib/allocator/tests/AccessTypeTest.h: In instantiation of ‘void facebook::cachelib::tests::AccessTypeTest<AccessType>::testIteratorMayContainNull() [with AccessType = facebook::cachelib::ChainedHashTable]’:
/home/runner/work/CacheLib/CacheLib/cachelib/allocator/tests/ChainedHashTest.cpp:57:29:   required from here
/home/runner/work/CacheLib/CacheLib/cachelib/../cachelib/allocator/tests/AccessTypeTest.h:595:13: error: no matching function for call to ‘facebook::cach
```

This diff fixes this failure in particular.

Reviewed By: therealgymmy

Differential Revision: D58554675

fbshipit-source-id: ffa0c110cf5bc79f1cdf58c51b572edf5bb797be

Author: haowu14

cachelib/allocator/tests/AccessTypeTest.h

@@ -593,7 +593,7 @@ template <typename AccessType>
 void AccessTypeTest<AccessType>::testIteratorMayContainNull() {
   std::string keyToReturnNull{};
   Container c{Config{}, PtrCompressor{},
-              [&keyToReturnNull](Node* node) -> Node::Handle {
+              [&keyToReturnNull](Node* node) -> typename Node::Handle {
                 if (!node) {
                   return nullptr;
                 }