Migrate off of soon-to-be-removed image macos-12

Author: hartwork

.github/workflows/tests.yml

@@ -53,14 +53,14 @@ jobs:
             cxx: g++-13
             clang_major_version: null
             clang_repo_suffix: null
-            runs-on: macos-12
+            runs-on: macos-13
             fuse_package: fuse-t
           # macFUSE
           - cc: clang-15
             cxx: clang++-15
             clang_major_version: 15
             clang_repo_suffix: null
-            runs-on: macos-12
+            runs-on: macos-13
             fuse_package: macfuse
     steps:
       - name: Add Clang/LLVM repositories