Update PhpShrink

diff --git a/externals/PhpShrink b/externals/PhpShrink
index 9ff1f4be6800a72e6cc866104b38a61d706b0417..7a4c6ac9ac102a32ed20ea02ac19ee99e7a815a7 160000 (submodule)
--- a/externals/PhpShrink
+++ b/externals/PhpShrink
@@ -1 +1 @@
-Subproject commit 9ff1f4be6800a72e6cc866104b38a61d706b0417
+Subproject commit 7a4c6ac9ac102a32ed20ea02ac19ee99e7a815a7