Update PIEX

Adds minimal support for Sony A7M3 ARW by extending the range to
look for a signature.
diff --git a/src/image_type_recognition/image_type_recognition_lite.cc b/src/image_type_recognition/image_type_recognition_lite.cc
index e0c8491..c56c1c0 100644
--- a/src/image_type_recognition/image_type_recognition_lite.cc
+++ b/src/image_type_recognition/image_type_recognition_lite.cc
@@ -149,7 +149,7 @@
  public:
   virtual RawImageTypes Type() const { return kArwImage; }
 
-  virtual size_t RequestedSize() const { return 5000; }
+  virtual size_t RequestedSize() const { return 10000; }
 
   // Check multiple points:
   // 1. valid endianness at the beginning of the file;