ci(tmp): try mac 26 runners

Author: aaraney

.github/workflows/test_and_validate.yml

@@ -116,7 +116,7 @@ jobs:
     # The type of runner that the job will run on
     strategy:
       matrix:
-        os: [ubuntu-22.04, macos-15]
+        os: [ubuntu-22.04, macos-26]
       fail-fast: false
     runs-on: ${{ matrix.os }}