ci: update macos runner images (libuv#4967)

Add macos-15 runners. Remove the deprecated macos-13 runners.

Fixes: libuv#4965
Refs: actions/runner-images#10924

Author: bnoordhuis

.github/workflows/CI-unix.yml

@@ -80,7 +80,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-13, macos-14]
+        os: [macos-14, macos-15]
     steps:
       - uses: actions/checkout@v6
       - name: Envinfo
@@ -107,6 +107,11 @@ jobs:
         run: |
           ./build/uv_run_tests_a platform_output
       - name: Test
+        if: ${{ maxtrix.os == 'macos-15' }}
+        run: |
+          cd build && sudo UV_RUN_AS_ROOT=1 ctest -V
+      - name: Test
+        if: ${{ maxtrix.os != 'macos-15' }}
         run: |
           cd build && ctest -V
       - name: Autotools configure
@@ -122,7 +127,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-13, macos-14]
+        os: [macos-14, macos-15]
     steps:
       - uses: actions/checkout@v6
       - name: Configure

.github/workflows/sanitizer.yml

@@ -55,7 +55,7 @@ jobs:
           fi
 
   sanitizers-macos:
-    runs-on: macos-13
+    runs-on: macos-14
     strategy:
       matrix:
         config: