Switch GH build to macos-13 to support java 8

Author: aherbert

.github/workflows/maven.yml

@@ -38,7 +38,7 @@ jobs:
     strategy:
       fail-fast: false # Run all the versions, but show overall status as failed if one fails
       matrix:
-        os: [ ubuntu-latest, macos-latest, windows-latest ]
+        os: [ ubuntu-latest, macos-13, windows-latest ]
         java: [ 8, 11, 17 ]
 
     steps:

.github/workflows/maven_legacy.yml

@@ -34,7 +34,7 @@ jobs:
     strategy:
       fail-fast: false # Run all the versions, but show overall status as failed if one fails
       matrix:
-        os: [ ubuntu-latest, macos-latest, windows-latest ]
+        os: [ ubuntu-latest, macos-13, windows-latest ]
         java: [ 8, 11, 17 ]
 
     steps: