Apply clang-tidy fixes to change `static_cast` to `proto2::DownCastToGenerated` in sr_www dependencies.

As a prerequisite of enabling go/protobuf-weak-speed-messages downcasts using built-in cast operations need to be changed to cast functions recommended by protobuf team (go/protobuf-downcast-recommendation)

**More information**: go/protobuf-stripping-lsc

#codehealth

PiperOrigin-RevId: 582977861

python/google/protobuf/pyext/descriptor_database.cc

@@ -16,6 +16,7 @@
 
 #include "google/protobuf/descriptor.pb.h"
 #include "absl/log/absl_log.h"
+#include "google/protobuf/message.h"
 #include "google/protobuf/pyext/message.h"
 #include "google/protobuf/pyext/scoped_pyobject_ptr.h"
 
@@ -54,7 +55,7 @@ static bool GetFileDescriptorProto(PyObject* py_descriptor,
       message->message->GetDescriptor() == filedescriptor_descriptor) {
     // Fast path: Just use the pointer.
     FileDescriptorProto* file_proto =
-        static_cast<FileDescriptorProto*>(message->message);
+        google::protobuf::DownCastToGenerated<FileDescriptorProto>(message->message);
     *output = *file_proto;
     return true;
   } else {