Use patched setup-swift to fix CI installation of Swift

For details, see

- swift-actions/setup-swift#591
- swift-actions/setup-swift#680

Author: fwcd

.github/workflows/SwiftPlot_Ubuntu.yml

@@ -17,7 +17,10 @@ jobs:
     - name: Install Swift Dependencies
       run: sudo apt-get install clang libicu-dev
     - name: Install Swift
-      uses: fwal/setup-swift@v1
+      # TODO: Use the release version again once
+      # https://github.com/swift-actions/setup-swift/pull/680
+      # is merged
+      uses: swift-actions/setup-swift@bb83339d1e8577741bdc6c65ba551ce7dc0fb854
       with:
         swift-version: "5.4"
     - name: Build