ci: use macos-15 instead of macos-latest

Author: erisu

.github/workflows/ci.yml

@@ -25,14 +25,18 @@ on:
     branches:
       - '*'
 
+permissions:
+  contents: read
+  security-events: write
+
 jobs:
   test:
     name: NodeJS ${{ matrix.node-version }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         node-version: [20.x, 22.x, 24.x]
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest, windows-latest, macos-15]
 
     steps:
       - uses: actions/checkout@v4