Update the checks in the soundness.yml to use Swift 6.1 Docker images (#156)

Author: shahmishal

.github/workflows/soundness.yml

@@ -18,15 +18,15 @@ on:
       api_breakage_check_container_image:
         type: string
         description: "Container image for the API breakage check job. Defaults to latest Swift Ubuntu image."
-        default: "swift:6.0-noble"
+        default: "swift:6.1-noble"
       docs_check_enabled:
         type: boolean
         description: "Boolean to enable the docs check job. Defaults to true."
         default: true
       docs_check_container_image:
         type: string
         description: "Container image for the docs check job. Defaults to latest Swift Ubuntu image."
-        default: "swift:6.0-noble"
+        default: "swift:6.1-noble"
       docs_check_additional_arguments:
         type: string
         description: "Additional arguments that should be passed to docc"
@@ -58,15 +58,15 @@ on:
       format_check_container_image:
         type: string
         description: "Container image for the format check job. Defaults to latest Swift Ubuntu image."
-        default: "swift:6.0-noble"
+        default: "swift:6.1-noble"
       shell_check_enabled:
         type: boolean
         description: "Boolean to enable the shell check job. Defaults to true."
         default: true
       shell_check_container_image:
         type: string
         description: "Container image for the shell check job. Defaults to latest Swift Ubuntu image."
-        default: "swift:6.0-noble"
+        default: "swift:6.1-noble"
       yamllint_check_enabled:
         type: boolean
         description: "Boolean to enable the YAML lint check job. Defaults to true."