Revert "Update hookshot 4.0.0 -> 4.1.0"

This reverts commit 428f7a1f75.

Looks like it won't become a tagged image until a "release" is posted.

roles/custom/matrix-bridge-hookshot/defaults/main.yml

@@ -10,7 +10,7 @@ matrix_hookshot_container_image_self_build: false
 matrix_hookshot_container_image_self_build_repo: "https://github.com/matrix-org/matrix-hookshot.git"
 matrix_hookshot_container_image_self_build_branch: "{{ 'main' if matrix_hookshot_version == 'latest' else matrix_hookshot_version }}"
 
-matrix_hookshot_version: 4.1.0
+matrix_hookshot_version: 4.0.0
 
 matrix_hookshot_docker_image: "{{ matrix_hookshot_docker_image_name_prefix }}halfshot/matrix-hookshot:{{ matrix_hookshot_version }}"
 matrix_hookshot_docker_image_name_prefix: "{{ 'localhost/' if matrix_hookshot_container_image_self_build else matrix_container_global_registry_prefix }}"