Upgrade Ruby to version 2.6.7

So get the latest security fixes in the 2.6.x series.

.gitlab-ci.yml

@@ -3,7 +3,7 @@ stages:
   - lint
 
 tests:
-  image: "ruby:2.6.6"
+  image: "ruby:2.6.7"
   stage: test
   services:
     - postgres:10.10
@@ -34,7 +34,7 @@ tests:
 # PRONTO_GITLAB_API_PRIVATE_TOKEN to your repository CI/CD settings
 # giving it the value of the Personal Access Token
 linters:
-  image: "ruby:2.6.6"
+  image: "ruby:2.6.7"
   stage: lint
   cache:
     key: consul

.ruby-version

@@ -1 +1 @@
-2.6.6
+2.6.7

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.6.6
+FROM ruby:2.6.7
 
 ENV DEBIAN_FRONTEND noninteractive
 

README.md

@@ -38,7 +38,7 @@ You can access the main website of the project at [http://consulproject.org](htt
 
 **NOTE**: For more detailed instructions check the [docs](https://docs.consulproject.org)
 
-Prerequisites: install git, Ruby 2.6.6, CMake, pkg-config, shared-mime-info, Node.js and PostgreSQL (>=9.5).
+Prerequisites: install git, Ruby 2.6.7, CMake, pkg-config, shared-mime-info, Node.js and PostgreSQL (>=9.5).
 
 ```bash
 git clone https://github.com/consul/consul.git

README_ES.md

@@ -36,7 +36,7 @@ Puedes acceder a la página principal del proyecto en [http://consulproject.org]
 
 **NOTA**: para unas instrucciones más detalladas consulta la [documentación](https://docs.consulproject.org)
 
-Prerequisitos: tener instalado git, Ruby 2.6.6, CMake, pkg-config, shared-mime-info, Node.js y PostgreSQL (9.5 o superior).
+Prerequisitos: tener instalado git, Ruby 2.6.7, CMake, pkg-config, shared-mime-info, Node.js y PostgreSQL (9.5 o superior).
 
 ```bash
 git clone https://github.com/consul/consul.git