ci: Update docker image to v0.11.11 for SDK 0.12.0

Update the docker image we build with to grab SDK 0.12.0 in addition to
0.11.4.

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

.buildkite/daily.yml

@@ -10,7 +10,7 @@ steps:
       manual: true
     plugins:
       - docker#v3.5.0:
-          image: "zephyrprojectrtos/ci:v0.11.10"
+          image: "zephyrprojectrtos/ci:v0.11.11"
           propagate-environment: true
           volumes:
             - "/var/lib/buildkite-agent/git-mirrors:/var/lib/buildkite-agent/git-mirrors"

.buildkite/pipeline.yml

@@ -10,7 +10,7 @@ steps:
       manual: true
     plugins:
       - docker#v3.5.0:
-          image: "zephyrprojectrtos/ci:v0.11.10"
+          image: "zephyrprojectrtos/ci:v0.11.11"
           propagate-environment: true
           volumes:
             - "/var/lib/buildkite-agent/git-mirrors:/var/lib/buildkite-agent/git-mirrors"