Tweaking runner actions

Author: mobrien-ghost

.github/workflows/unit-tests.yml

@@ -46,7 +46,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-13]
-        swift: ["latest", "5.9", "5.8"]
+        swift: ["5.9", "5.8"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: swift-actions/setup-swift@v1