Change kMaxBlockSizeBytes to Long Long for cross platform compatibility

Author: nateprewitt

cpp/src/arrow/filesystem/azurefs.cc

@@ -970,7 +970,7 @@ Status StageBlock(Blobs::BlockBlobClient* block_blob_client, const std::string&
 /// Writes will be buffered up to this size (in bytes) before actually uploading them.
 static constexpr int64_t kBlockUploadSizeBytes = 10 * 1024 * 1024;
 /// The maximum size of a block in Azure Blob (as per docs).
-static constexpr int64_t kMaxBlockSizeBytes = 4UL * 1024 * 1024 * 1024;
+static constexpr int64_t kMaxBlockSizeBytes = 4LL * 1024 * 1024 * 1024;
 
 /// This output stream, similar to other arrow OutputStreams, is not thread-safe.
 class ObjectAppendStream final : public io::OutputStream {