Test against python 3.13, stop testing with python 3.8, test against ESMF 8.8. (#403)

* Remove python 3.8/esmf 8.2, add python 3.13

* Test against ESMF 8.8

---------

Co-authored-by: raphael dussin <[email protected]>

Author: aulemahal

.github/workflows/ci.yaml

@@ -22,8 +22,6 @@ jobs:
       matrix:
         include:
           # Warning: Unless in quotations, numbers below are read as floats. 3.10 < 3.2
-          - python-version: "3.8"
-            esmf-version: 8.2
           - python-version: "3.9"
             esmf-version: 8.3
           - python-version: "3.10"
@@ -32,6 +30,8 @@ jobs:
             esmf-version: 8.6
           - python-version: "3.12"
             esmf-version: 8.7
+          - python-version: "3.13"
+            esmf-version: 8.8
     steps:
       - name: Cancel previous runs
         uses: styfle/[email protected]