Patch a CI failure

Author: davidanthoff

.github/workflows/jlpkgbutler-ci-pr-workflow.yml

@@ -11,9 +11,9 @@ jobs:
       matrix:
         julia-version: ['1.0', '1.1', '1.2', '1.3', '1.4', '1.5', '1.6', '1.7', '1.8', '1.9', '1.10']
         julia-arch: [x64, x86]
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-latest, windows-latest, macos-13]
         exclude:
-          - os: macOS-latest
+          - os: macos-13
             julia-arch: x86
 
     steps: