gh-159612: Remove macOS x86_64 from JIT CI due to LLVM timeouts (#160033)

Author: hugovk

.github/workflows/jit.yml

@@ -87,24 +87,16 @@ jobs:
           ./PCbuild/rt.bat ${{ matrix.debug && '-d' || '' }} -p ${{ matrix.architecture }} -q --multiprocess 0 --timeout 4500 --verbose2 --verbose3
 
   macos:
-    name: ${{ matrix.target }} (${{ matrix.debug && 'Debug' || 'Release' }})
+    name: aarch64-apple-darwin/clang (${{ matrix.debug && 'Debug' || 'Release' }})
 
-    runs-on: ${{ matrix.runner }}
+    runs-on: macos-26
     timeout-minutes: 60
     strategy:
       fail-fast: false
       matrix:
-        target:
-          - x86_64-apple-darwin/clang
-          - aarch64-apple-darwin/clang
         debug:
           - true
           - false
-        include:
-          - target: x86_64-apple-darwin/clang
-            runner: macos-26-intel
-          - target: aarch64-apple-darwin/clang
-            runner: macos-26
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with: