Update reference versions

Author: MakisH

tools/tests/reference_versions.yaml

@@ -4,7 +4,7 @@ OPENFOAM_EXECUTABLE: "openfoam2512"
 OPENFOAM_ADAPTER_REF: "v1.3.1"
 PYTHON_BINDINGS_REF: "v3.3.0"
 FENICS_ADAPTER_REF: "v2.2.0"
-TUTORIALS_REF: "b3de2af" # develop, December 23, 2025
+TUTORIALS_REF: "c237411" # develop, December 29, 2025
 PLATFORM: "ubuntu_2404"
 CALCULIX_VERSION: "2.20"
 CALCULIX_ADAPTER_REF: "v2.20.1"