Changing Juju version in Docker

The juju that is integrated in the LCM container,
contains a pinned version and needs to be updated
for new functionality.

Change-Id: I63a8926e745962494224aa804b6ce04f78a7f7b0
Signed-off-by: Dominik Fleischmann <dominik.fleischmann@canonical.com>
diff --git a/Dockerfile.local b/Dockerfile.local
index 25775d6..a64bf4c 100644
--- a/Dockerfile.local
+++ b/Dockerfile.local
@@ -29,8 +29,8 @@
     && mv linux-amd64/helm /usr/local/bin/helm \
     && rm -r linux-amd64/
 
-RUN curl -L https://launchpad.net/juju/2.7/2.7.0/+download/juju-2.7.0-k8s.tar.xz --output juju-2.7.0-k8s.tar.xz \
-    && tar -xvf juju-2.7.0-k8s.tar.xz \
+RUN curl -L https://launchpad.net/juju/2.7/2.7.6/+download/juju-2.7.6-k8s.tar.xz --output juju-2.7.6-k8s.tar.xz \
+    && tar -xvf juju-2.7.6-k8s.tar.xz \
     && mv juju /usr/local/bin/juju
 
 RUN apt-get update && apt-get install -y git tox python3 \