chore(deps): update ghost/traffic-analytics docker tag to v1.0.21 (#96)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

compose.yml

@@ -82,7 +82,7 @@ services:
       - ghost_network
 
   traffic-analytics:
-    image: ghost/traffic-analytics:1.0.20@sha256:a72573d89457e778b00e9061422516d2d266d79a72a0fc02005ba6466e391859
+    image: ghost/traffic-analytics:1.0.21@sha256:698f025864ae838ae24fbd515ee811f74ddf9ca73801e9bcbfec01367655fcb2
     restart: always
     expose:
       - "3000"