Updates the Stan submodule to b95e97dfc.

stan-buildbot · stan-buildbot · commit c1b497deecba · 2026-07-01T18:46:54.000-04:00
diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit 3c6c26cc2b041ec753f1315f7b4ee67637abd403
+Subproject commit b95e97dfc9c3db5ad1e54df49fc236334a03cfbf
