fix(ci): use macos-15 runner to fix xlings dyld compatibility

Author: Sunrisepeak

.github/workflows/ci-macos.yml

@@ -23,7 +23,7 @@ concurrency:
 jobs:
   macos-llvm-validation:
     name: macOS ARM64 — LLVM toolchain validation
-    runs-on: macos-14
+    runs-on: macos-15
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
@@ -147,7 +147,7 @@ jobs:
 
   macos-xlings-compat:
     name: macOS ARM64 — xlings binary compatibility check
-    runs-on: macos-14
+    runs-on: macos-15
     timeout-minutes: 10
     continue-on-error: true
     steps: