prometheus: Update to 2.6.0

Signed-off-by: Rosen Penev <rosenp@gmail.com>

utils/prometheus/Makefile

@@ -1,12 +1,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=prometheus
-PKG_VERSION:=2.3.2
+PKG_VERSION:=2.6.0
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/prometheus/prometheus/tar.gz/v${PKG_VERSION}?
-PKG_HASH:=008282497e2e85de6fb17a698dfdae4a942026f623d8a9d45b911a765442cb58
+PKG_HASH:=e0d3e77e45466fd055726268354a02834968a3275791be6cbd17513ec7860c1d
 
 PKG_LICENSE:=Apache-2.0
 PKG_LICENSE_FILES:=LICENSE