Update XNNPACK to 3131afe (pytorch#13234)

mcr229 · agrima1304 · commit f86285c8a620 · 2025-08-26T14:48:50.000+01:00
diff --git a/backends/xnnpack/third-party/XNNPACK b/backends/xnnpack/third-party/XNNPACK
@@ -1 +1 @@
-Subproject commit 52208356940a7c7d3597cf386d500a0f776f7bd0
+Subproject commit 3131afead790c5c69a9aa12273dfc40399789ad7
