Fix date typo

Author: MakisH

tools/tests/reference_versions.yaml

@@ -4,7 +4,7 @@ OPENFOAM_EXECUTABLE: "openfoam2312"
 OPENFOAM_ADAPTER_REF: "v1.3.1"
 PYTHON_BINDINGS_REF: "v3.1.2"
 FENICS_ADAPTER_REF: "v2.2.0"
-TUTORIALS_REF: "3936aa6" # develop, February 22, 2025
+TUTORIALS_REF: "3936aa6" # develop, February 21, 2025
 PLATFORM: "ubuntu_2404"
 CALCULIX_VERSION: "2.20"
 CALCULIX_ADAPTER_REF: "v2.20.1"