Update registry.gitlab.com/etke.cc/buscarron Docker tag to v1.4.0

roles/custom/matrix-bot-buscarron/defaults/main.yml

@@ -6,7 +6,7 @@
 matrix_bot_buscarron_enabled: true
 
 # renovate: datasource=docker depName=registry.gitlab.com/etke.cc/buscarron
-matrix_bot_buscarron_version: v1.3.1
+matrix_bot_buscarron_version: v1.4.0
 
 # The hostname at which Buscarron is served.
 matrix_bot_buscarron_hostname: ''