Bug 1652807 [wpt PR 24591] - Add Servo dependency to docker., a=testonly

Automatic update from web-platform-tests
Add Servo dependency to docker.

--

wpt-commits: f10f2ba6142d68a7d37736149a71e7e08e55eda3
wpt-pr: 24591

testing/web-platform/tests/.taskcluster.yml

@@ -57,7 +57,7 @@ tasks:
             owner: ${owner}
             source: ${event.repository.clone_url}
           payload:
-            image: webplatformtests/wpt:0.41
+            image: webplatformtests/wpt:0.42
             maxRunTime: 7200
             artifacts:
               public/results:

testing/web-platform/tests/tools/ci/tc/tasks/test.yml

@@ -4,7 +4,7 @@ components:
     workerType: ci
     schedulerId: taskcluster-github
     deadline: "24 hours"
-    image: webplatformtests/wpt:0.41
+    image: webplatformtests/wpt:0.42
     maxRunTime: 7200
     artifacts:
       public/results:

testing/web-platform/tests/tools/docker/Dockerfile

@@ -20,6 +20,7 @@ RUN apt-get -qqy update \
     libvirt-daemon-system \
     libvirt-clients \
     libunwind8 \
+    libxcb-shape0-dev \
     locales \
     openjdk-8-jre-headless \
     pulseaudio \