SG-32814 Fixup supported versions (shotgunsoftware#51)

Author: julien-lang

README.md

@@ -1,6 +1,6 @@
 # Toolkit Engine for 3ds Max
 
-![Supported 3ds Max versions: 2023 - 2026](https://img.shields.io/badge/3ds%20Max-2026_|_2025_|_2024_|_2023-blue?logo=autodesk "Supported 3ds Max versions")
+![Supported 3ds Max versions: 2023 - 2026](https://img.shields.io/badge/3ds%20Max-2023_--_2026-blue?logo=autodesk "Supported 3ds Max versions")
 [![Supported VFX Platform: 2022 - 2025](https://img.shields.io/badge/VFX_Platform-2025_|_2024_|_2023_|_2022-blue)](http://www.vfxplatform.com/ "Supported VFX Platform")
 [![Supported Python versions: 3.9 - 3.11](https://img.shields.io/badge/Python-3.11_|_3.10_|_3.9-blue?logo=python&logoColor=f5f5f5)](https://www.python.org/ "Supported Python versions")
 

engine.py

@@ -17,9 +17,9 @@
 import pymxs
 
 # Max versions compatibility constants
-VERSION_OLDEST_COMPATIBLE = 2023
-VERSION_OLDEST_SUPPORTED = 2024
-VERSION_NEWEST_SUPPORTED = 2025
+VERSION_OLDEST_COMPATIBLE = 2021
+VERSION_OLDEST_SUPPORTED = 2023
+VERSION_NEWEST_SUPPORTED = 2026
 # Caution: make sure compatibility_dialog_min_version default value in info.yml
 # is equal to VERSION_NEWEST_SUPPORTED