Merge pull request #2405 from puppetlabs/CONT-772-Puppet_8_support

(CONT-772) Puppet 8 support / Drop Puppet 6

Author: jordanbreen28

.devcontainer/devcontainer.json

@@ -5,7 +5,7 @@
 	"settings": {
 		"terminal.integrated.profiles.linux": {
 			"bash": {
-				"path": "bash",
+				"path": "bash"
 			}
 		}
 	},

.fixtures.yml

@@ -6,7 +6,7 @@ fixtures:
     provision: 'https://github.com/puppetlabs/provision.git'
     puppet_agent:
       repo: 'https://github.com/puppetlabs/puppetlabs-puppet_agent.git'
-      ref: v4.12.1
+      ref: v4.13.0
     stdlib: "https://github.com/puppetlabs/puppetlabs-stdlib.git"
     yumrepo_core: 
       repo: "https://github.com/puppetlabs/puppetlabs-yumrepo_core.git"