Adjust Swift version

Author: danielsaidi

.github/workflows/swift.yml

@@ -11,12 +11,13 @@ on:
 
 jobs:
   build:
-
     runs-on: macos-latest
-
     steps:
-    - uses: actions/checkout@v3
-    - name: Build
-      run: swift build -v
-    - name: Run tests
-      run: swift test -v
+      - uses: actions/checkout@v3
+      - uses: swift-actions/setup-swift@65540b95f51493d65f5e59e97dcef9629ddf11bf
+        with:
+          swift-version: "5.8"
+      - name: Build
+        run: swift build -v
+      - name: Run tests
+        run: swift test -v