change macos-latest runners to use arm64 architecture to address GitHub Actions failures including https://github.com/softwareengineerprogrammer/GEOPHIRES/actions/runs/16888333182/job/47841807973?pr=97

Author: softwareengineerprogrammer

.github/workflows/github-actions.yml

@@ -65,7 +65,7 @@ jobs:
           - name: 'py311 (macos)'
             python: '3.11'
             toxpython: 'python3.11'
-            python_arch: 'x64'
+            python_arch: 'arm64'
             tox_env: 'py311'
             os: 'macos-latest'
           - name: 'py311 (windows)'
@@ -84,7 +84,7 @@ jobs:
 #          - name: 'pypy38 (macos)'
 #            python: 'pypy-3.8'
 #            toxpython: 'pypy3.8'
-#            python_arch: 'x64'
+#            python_arch: 'arm64'
 #            tox_env: 'pypy38'
 #            os: 'macos-latest'
 #          - name: 'pypy39 (ubuntu)'
@@ -96,7 +96,7 @@ jobs:
 #          - name: 'pypy39 (macos)'
 #            python: 'pypy-3.9'
 #            toxpython: 'pypy3.9'
-#            python_arch: 'x64'
+#            python_arch: 'arm64'
 #            tox_env: 'pypy39'
 #            os: 'macos-latest'