update pins and supported pythons

Author: valeriupredoi

setup.py

@@ -29,18 +29,19 @@
         'License :: Other/Proprietary License',
         'Natural Language :: English',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Topic :: Scientific/Engineering',
         'Topic :: Scientific/Engineering :: Atmospheric Science',
         'Topic :: Scientific/Engineering :: GIS',
         'Topic :: Scientific/Engineering :: Hydrology',
         'Topic :: Scientific/Engineering :: Physics',
     ],
     install_requires=[
-        'scitools-iris>=2.2',
+        'scitools-iris>=3.6',
     ],
     extras_require={
         'develop': [