Updates the Stan submodule to 0c44a6dfc.

stan-buildbot · stan-buildbot · commit 5da45e93b040 · 2025-03-18T03:49:53.000-04:00
diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit 86287268a9ef9207eedf022df43d71063d7e0983
+Subproject commit 0c44a6dfc030a20e07e5950817046fc7526126e4
