Update Docker image version in CI configurations

PR web-platform-tests#44493 updated the Dockerfile and also bumped
the version of docker image to use in Taskcluster
configuration from 0.56 to 0.57. However, 0.57
refers to an exiting image that was published to
Docker Hub but never used in the CI configurations.

This PR is to bump the version again so that the
changes introduced by web-platform-tests#44493 are consumed by the
CI configuration.

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>

.taskcluster.yml

@@ -57,7 +57,7 @@ tasks:
             owner: ${owner}
             source: ${event.repository.clone_url}
           payload:
-            image: webplatformtests/wpt:0.57
+            image: webplatformtests/wpt:0.58
             maxRunTime: 7200
             artifacts:
               public/results:

tools/ci/tc/tasks/test.yml

@@ -4,7 +4,7 @@ components:
     workerType: ci
     schedulerId: taskcluster-github
     deadline: "24 hours"
-    image: webplatformtests/wpt:0.57
+    image: webplatformtests/wpt:0.58
     maxRunTime: 7200
     artifacts:
       public/results: