GHA: Build against Swift 6.1

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Author: helje5

.github/workflows/swift.yml

@@ -14,8 +14,7 @@ jobs:
       matrix:
         image:
           - swift:5.9.2-focal
-          - swift:5.10-jammy
-          - swift:6.0-noble
+          - swift:6.1-noble
     container: ${{ matrix.image }}
     steps:
       - name: Checkout Repository