macos 13 deprecated

Author: Anton-4

.github/workflows/ci_nix.yml

@@ -15,8 +15,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # macos-13 uses x86-64 machine, macos-14 & 15 use aarch64
-        os: [macos-13, macos-15, ubuntu-22.04, ubuntu-24.04-arm]
+        # macos-15-intel uses x86-64 machine, macos-14 & 15 use aarch64
+        os: [macos-15-intel, macos-15, ubuntu-22.04, ubuntu-24.04-arm]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4