Workflow update

Author: lmbelo

.github/workflows/pypi.yml

@@ -91,7 +91,7 @@ jobs:
       matrix:
         python: ['3.11']
         include:
-          - os: [ubuntu-latest]
+          - os: [ubuntu-13]
             arch: ["x86_64"]
 
     steps:
@@ -299,7 +299,7 @@ jobs:
       matrix:
         python: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
         include:
-          - os: [macos-latest]
+          - os: [macos-13]
             arch: ["x86_64"]
     steps:
     - name: Check out repository