feat: add macos-15 runner to matrix (#38)

* ci: add macos-15 runner to matrix
* ci: remove macos-13 runner from matrix

Author: cmorten

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-12, macos-13, macos-14, windows-2019, windows-2022]
+        os: [macos-13, macos-14, macos-15, windows-2019, windows-2022]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3