ci: update runners

Author: adriweb

.github/workflows/build.yml

@@ -12,8 +12,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04,ubuntu-latest,macOS-13,macOS-latest]
+        os: [ubuntu-22.04,ubuntu-latest,macOS-15-intel,macOS-latest]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
       - run: make -j4
       - run: ./tivars_tests