Fix 'out-of-line definition of constexpr' build error for XCode 15 for React Native (#38079)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/38079

This diff fixes the
```
out-of-line definition of constexpr static data member is redundant in C++17 and is deprecated [-Werror,-Wdeprecated]
```
error in `RAMBundleRegistry`

## Changelog:
[internal] - Fix Xcode 15 namespace build errors in `RAMBundleRegistry`.

Reviewed By: javache, cipolleschi

Differential Revision: D46988689

fbshipit-source-id: 5dc34b0f7d6fb266bc379b3639244bf69505aa88

packages/react-native/ReactCommon/cxxreact/RAMBundleRegistry.cpp

@@ -13,7 +13,10 @@
 
 namespace facebook::react {
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
 constexpr uint32_t RAMBundleRegistry::MAIN_BUNDLE_ID;
+#pragma clang diagnostic pop
 
 std::unique_ptr<RAMBundleRegistry> RAMBundleRegistry::singleBundleRegistry(
     std::unique_ptr<JSModulesUnbundle> mainBundle) {