Update kibana to 7.17.21

Author: wodbot

.github/workflows/workflow.yml

@@ -19,5 +19,5 @@ jobs:
     - uses: actions/checkout@v2
     - uses: ./.github/actions
       with:
-        version: '7.17.20'
+        version: '7.17.21'
         tags: 7.17,7,latest

Makefile

@@ -1,6 +1,6 @@
 -include env_make
 
-KIBANA_VER ?= 7.17.20
+KIBANA_VER ?= 7.17.21
 KIBANA_VER_MINOR=$(shell echo "${KIBANA_VER}" | grep -oE '^[0-9]+\.[0-9]+')
 
 NODEJS_VER ?= $(shell wget -qO- "https://raw.githubusercontent.com/elastic/kibana/v$(KIBANA_VER)/.node-version")