Replace Prometheus v1 image with v2

Author: cityofships

docker/prometheus/prometheus-server/Dockerfile.j2

@@ -6,7 +6,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {% block prometheus_server_header %}{% endblock %}
 
 {% block prometheus_server_repository_version %}
-ENV prometheus_version=1.8.2
+ENV prometheus_version=2.25.0
 {% endblock %}
 
 {% block prometheus_server_install %}