Merge sequoia-tests: run macOS tests on a macOS-latest CI runner.

Author: culler

.github/workflows/mac-build.yml

@@ -5,6 +5,7 @@ on:
     - "main"
     - "core-8-branch"
     - "core-8-6-branch"
+    - "sequoia-tests"
     tags:
     - "core-**"
 permissions:
@@ -13,7 +14,7 @@ env:
   ERROR_ON_FAILURES: 1
 jobs:
   xcode:
-    runs-on: macos-14
+    runs-on: macos-15
     defaults:
       run:
         shell: bash
@@ -48,7 +49,7 @@ jobs:
           }
       - name: Run Tests
         run: |
-          make test | tee out.txt
+          make TK_NO_STDERR=1 test | tee out.txt
           nmatches=$( grep -c "Failed	0" out.txt )
           if [ $nmatches -lt 4 ]
           then