Switch to FacterDB 3 / drop legacy facts

Version 3 of FacterDB drops support for legacy facts.

rspec-puppet-facts.gemspec

@@ -27,6 +27,6 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency 'deep_merge', '~> 1.2'
   s.add_runtime_dependency 'facter', '< 5'
-  s.add_runtime_dependency 'facterdb', '~> 2.1'
+  s.add_runtime_dependency 'facterdb', '~> 3.1'
   s.add_runtime_dependency 'puppet', '>= 7', '< 9'
 end

spec/fixtures/metadata.json

@@ -22,7 +22,6 @@
     {
       "operatingsystem": "RedHat",
       "operatingsystemrelease": [
-        "7",
         "8",
         "9"
       ]

spec/rspec_puppet_facts_spec.rb

@@ -215,7 +215,6 @@
             expect(subject.keys).to contain_exactly(
               'debian-11-x86_64',
               'debian-12-x86_64',
-              'redhat-7-x86_64',
               'redhat-8-x86_64',
               'redhat-9-x86_64',
             )
@@ -224,7 +223,6 @@
           it 'is able to filter the received OS facts' do
             allow(described_class).to receive(:spec_facts_os_filter).and_return('redhat')
             expect(subject.keys).to contain_exactly(
-              'redhat-7-x86_64',
               'redhat-8-x86_64',
               'redhat-9-x86_64',
             )
@@ -319,7 +317,7 @@
       end
 
       it 'returns a fact set for the specified release' do
-        expect(factsets).to match('redhat-9-x86_64' => include(operatingsystemmajrelease: '9'))
+        expect(factsets['redhat-9-x86_64'][:os]['release']['major']).to eql('9')
       end
     end