Stub os.release.major to return a String

The os.release.major fact is defined to be a string[1], so stub it accordingly

[1] https://github.com/puppetlabs/facter/blob/4.7.1/lib/schema/facter.yaml#L1156-L1157

Author: joshcooper

spec/classes/puppet_agent_osfamily_redhat_spec.rb

@@ -22,19 +22,19 @@
   end
 
   [
-    ['Rocky', 'el/8', 8],
-    ['AlmaLinux', 'el/8', 8],
-    ['AlmaLinux', 'el/9', 9],
-    ['Fedora', 'fedora/f36', 36],
-    ['CentOS', 'el/7', 7],
-    ['Amazon', 'el/6', 2017],
-    ['Amazon', 'el/6', 2018],
-    ['Amazon', 'amazon/2', 2],
-    ['Amazon', 'amazon/2023', 2023],
+    ['Rocky', 'el/8', '8'],
+    ['AlmaLinux', 'el/8', '8'],
+    ['AlmaLinux', 'el/9', '9'],
+    ['Fedora', 'fedora/f36', '36'],
+    ['CentOS', 'el/7', '7'],
+    ['Amazon', 'el/6', '2017'],
+    ['Amazon', 'el/6', '2018'],
+    ['Amazon', 'amazon/2', '2'],
+    ['Amazon', 'amazon/2023', '2023'],
   ].each do |os, urlbit, osmajor|
     context "with #{os} and #{urlbit}" do
       let(:facts) do
-        override_facts(super(), os: { name: os, release: { major: osmajor, }, })
+        override_facts(super(), os: { name: os, release: { major: osmajor } })
       end
 
       script = <<-SCRIPT
@@ -170,7 +170,7 @@
     end
   end
 
-  [['RedHat', 'el-7-x86_64', 'el-7-x86_64', 7], ['RedHat', 'el-8-x86_64', 'el-8-x86_64', 8], ['Amazon', '', 'el-6-x64', 6]].each do |os, tag, repodir, osmajor|
+  [['RedHat', 'el-7-x86_64', 'el-7-x86_64', '7'], ['RedHat', 'el-8-x86_64', 'el-8-x86_64', '8'], ['Amazon', '', 'el-6-x64', '6']].each do |os, tag, repodir, osmajor|
     context "when PE on #{os}" do
       before(:each) do
         # Need to mock the PE functions