ci: bind specifically to localhost for proxy

Bind the proxy specifically to 127.0.0.1 instead of all addresses.  This
is not strictly necessary for operations, but having a potentially open
proxy on a network is not a good idea.

ci/test.sh

@@ -73,8 +73,8 @@ fi
 
 if [ -z "$SKIP_PROXY_TESTS" ]; then
 	echo "Starting HTTP proxy..."
-	curl -L https://github.com/ethomson/poxyproxy/releases/download/v0.1.0/poxyproxy-0.1.0.jar >poxyproxy.jar
-	java -jar poxyproxy.jar -d --port 8080 --credentials foo:bar >/dev/null 2>&1 &
+	curl -L https://github.com/ethomson/poxyproxy/releases/download/v0.2.0/poxyproxy-0.2.0.jar >poxyproxy.jar
+	java -jar poxyproxy.jar -d --address 127.0.0.1 --port 8080 --credentials foo:bar >/dev/null 2>&1 &
 fi
 
 if [ -z "$SKIP_SSH_TESTS" ]; then