build: Update macOS image version in CLI tests workflow

Author: rahulkanneri-2u

.github/workflows/cli-tests.yml

@@ -25,7 +25,7 @@ jobs:
           - name: linux
             image: ubuntu-latest
           - name: mac
-            image: macos-15-intel
+            image: macos-26-intel
         python-version:
           - '3.11'
       fail-fast: false