Update environment.yml Fixes #47

Honestly I am not sure it is reasonable to require 3.12 at this time. Many users are stuck on lower python versions. 

Anyway, fixes #47

Author: davidosterberg

environment.yml

@@ -2,7 +2,7 @@ name: metocean-api
 channels:
   - conda-forge
 dependencies:
-  - python=>3.9
+  - python=>3.12
   - matplotlib>=3.1
   - numpy>=1.17
   - pandas