use latest alias to fetch the latest version

Author: sebsto

.github/workflows/examples_matrix.yml

@@ -17,8 +17,8 @@ on:
         required: true
       matrix_linux_swift_container_image:
         type: string
-        description: "Container image for the 6.0 Swift version matrix job. Defaults to matching latest Swift Ubuntu image."
-        default: "swift:6.0.1-noble"
+        description: "Container image for the matrix job. Defaults to matching latest Swift Ubuntu image."
+        default: "swift:latest"
 
 ## We are cancelling previously triggered workflow runs
 concurrency: