Update concat dependency to be compatible with concat 3.x and 4.x

metadata.json

diff --git a/metadata.json b/metadata.json
index 940e00c..8f2cbac 100644
--- a/metadata.json
+++ b/metadata.json
@@ -88,7 +88,7 @@
   "description": "Manage SSH",
   "dependencies": [
     {"name":"puppetlabs/stdlib","version_requirement":">= 4.6.0 < 6.0.0"},
-    {"name":"puppetlabs/concat","version_requirement":">= 2.0.0 < 3.0.0"},
+    {"name":"puppetlabs/concat","version_requirement":">= 2.0.0 < 5.0.0"},
     {"name":"ghoneycutt/common","version_requirement":">= 1.4.1 < 2.0.0"},
     {"name":"puppetlabs/firewall","version_requirement":">= 1.9.0 < 2.0.0"}
   ]