ci: update to poxygit v0.6.0

v0.6.0 of poxygit add support for throttling connections to test
timeouts and low-bandwidth situations.

ci/test.sh

@@ -171,7 +171,7 @@ if [ -z "$SKIP_PROXY_TESTS" ]; then
 fi
 
 if [ -z "$SKIP_NTLM_TESTS" -o -z "$SKIP_ONLINE_TESTS" ]; then
-	curl --location --silent --show-error https://github.com/ethomson/poxygit/releases/download/v0.5.1/poxygit-0.5.1.jar >poxygit.jar
+	curl --location --silent --show-error https://github.com/ethomson/poxygit/releases/download/v0.6.0/poxygit-0.6.0.jar >poxygit.jar
 
 	echo "Starting HTTP server..."
 	HTTP_DIR=`mktemp -d ${TMPDIR}/http.XXXXXXXX`