Simpler test script.

.github/workflows/ci.yml

@@ -5,25 +5,21 @@ on:
   push:
 
 jobs:
-
   build-release:
     strategy:
       matrix:
         # https://github.com/actions/virtual-environments
         os: [macos-12, ubuntu-20.04]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
-      - run: swift build --disable-automatic-resolution -c release
+      - uses: actions/checkout@v4
+      - name: Check a Release build
+        run: swift build --disable-automatic-resolution -c release
 
   run-tests:
-    strategy:
-      matrix:
-        swift-version: [5.8, 5.9, 5.10, 6.0]
     runs-on: ubuntu-20.04
     steps:
+      - uses: actions/checkout@v4
       - uses: fwal/setup-swift@v1
-        with:
-          swift-version: ${{ matrix.swift-version }}
-      - uses: actions/checkout@v2
-      - run: swift test
+      - name: Run tests
+        run: swift test