Update varnish to 6.0.15

Author: wodbot

.github/workflows/workflow.yml

@@ -10,7 +10,7 @@ on:
 
 env:
   BASE_IMAGE_STABILITY_TAG: 2.18.2
-  VARNISH60: '6.0.14'
+  VARNISH60: '6.0.15'
 
 jobs:
   varnish60-build:

Makefile

@@ -1,6 +1,6 @@
 -include env.mk
 
-VARNISH_VER ?= 6.0.14
+VARNISH_VER ?= 6.0.15
 VARNISH_VER_MINOR = $(shell echo "${VARNISH_VER}" | grep -oE '^[0-9]+\.[0-9]+')
 
 ALPINE_VER ?= 3.20