Merge pull request Pyomo#3269 from mrmundt/skip-win-3.8

Skip Windows Python 3.8

Author: blnicho

.github/workflows/test_pr_and_main.yml

@@ -86,6 +86,11 @@ jobs:
         other: [""]
         category: [""]
 
+        # win/3.8 conda builds no longer work due to environment not being able
+        # to resolve. We are skipping it now.
+        exclude:
+        - os: windows-latest
+          python: 3.8
         include:
         - os: ubuntu-latest
           TARGET: linux