(maint) Pinning puppetlabs/firewall to 3.6.0

The pam_firewall module currently uses structures that are removed from
newer versions of the firewall module.  Unfortunately,
puppetlabs/puppetlabs-firewall#1170 prevents
us from moving directly to the latest.  Until that is resolved, this
commit pins to a known working version of the module.

.fixtures.yml

@@ -4,4 +4,6 @@
 fixtures:
   forge_modules:
     stdlib: "puppetlabs/stdlib"
-    firewall: "puppetlabs/firewall"
+    firewall:
+     repo: "puppetlabs/firewall"
+     ref: "3.6.0"

Puppetfile

@@ -4,5 +4,5 @@
 # The following directive installs modules to the managed moduledir.
 moduledir '.modules'
 
-mod 'puppetlabs/firewall', '3.1.0'
+mod 'puppetlabs/firewall', '3.6.0'
 mod 'puppetlabs/stdlib', '7.1.0'

bolt-project.yaml

@@ -1,4 +1,5 @@
 ---
 name: pam_firewall
 modules:
-- puppetlabs/firewall
+- name: puppetlabs/firewall
+  version_requirement: '3.6.0'