CI: Bump tools versions

Docker CLI to 18.03.0, Linuxkit to v0.3, Notary to v0.6.0.

Signed-off-by: Ian Campbell <ijc@docker.com>

Author: Ian Campbell

.circleci/config.yml

@@ -102,24 +102,24 @@ jobs:
       - run:
           name: Fetch binaries
           command: |
-            curl -fsSL -o /tmp/docker.tgz https://download.docker.com/linux/static/stable/x86_64/docker-17.06.2-ce.tgz
+            curl -fsSL -o /tmp/docker.tgz https://download.docker.com/linux/static/stable/x86_64/docker-18.03.0-ce.tgz
             tar xfO /tmp/docker.tgz docker/docker > /workspace/bin/docker
             # To update find the most recent successful build at https://circleci.com/gh/linuxkit/linuxkit/tree/master
             # and find the link + SHA256 in the `Artifacts` tab
-            curl -fsSL -o /workspace/bin/linuxkit https://501-46932243-gh.circle-artifacts.com/0/linuxkit-linux-amd64
+            curl -fsSL -o /workspace/bin/linuxkit https://github.com/linuxkit/linuxkit/releases/download/v0.3/linuxkit-linux-amd64
             curl -fsSL -o /workspace/bin/manifest-tool https://github.com/estesp/manifest-tool/releases/download/v0.7.0/manifest-tool-linux-amd64
-            curl -fsSL -o /workspace/bin/notary https://github.com/theupdateframework/notary/releases/download/v0.4.3/notary-Linux-amd64
+            curl -fsSL -o /workspace/bin/notary https://github.com/theupdateframework/notary/releases/download/v0.6.0/notary-Linux-amd64
 
             echo "Downloaded:"
             sha256sum /workspace/bin/*
             echo
 
             echo "Checking checksums"
             sha256sum -c <<EOF
-            6af40e74b2dbb2927882acab52d50bfc72551779d541957fc70b6adc325ee5ef  /workspace/bin/docker
-            fd15a491d834e93c29729d8dc295d1684ec2cf1df42fb751ff20bd0b2a3e5110  /workspace/bin/linuxkit
+            f5ea546a4ccd64fbb71825f964171256388f1181b000f3c56747075e383c81c6  /workspace/bin/docker
+            7058bb86c6eeab6faf563c7c61537579e7a493b9e1f74835a554f0ac7345e1bf  /workspace/bin/linuxkit
             e4ca2ef0015a4be8597d31d9e3e70d88da33924ae72b0999e9f3b79304d4710d  /workspace/bin/manifest-tool
-            06cd02c4c2e7a3b1ad9899b03b3d4dde5392d964c675247d32f604a24661f839  /workspace/bin/notary
+            f4e421b3bb3c32c39372f7f02fbe80c67580cccd381f9722b1c702b3ab63a1c7  /workspace/bin/notary
             EOF
       - run:
           name: Versions