(CAT-2281) Remove puppet 7 infrastructure

Puppet 7 is EOL. Therefore, we can remove the test infrastructure for it.
This commit aims to clear up any testing/config infrastructure related to
Puppet 7 and, by extension, Ruby 2.7.

Author: LukasAud

.github/workflows/ci.yml

@@ -18,11 +18,8 @@ jobs:
       fail-fast: false
       matrix:
         ruby_version:
-          - "2.7"
           - "3.2"
         include:
-          - ruby-version: '2.7'
-            puppet_gem_version: '~> 7.0'
           - ruby_version: '3.2'
             puppet_gem_version: '~> 8.0' # puppet8'
         runs_on:
@@ -42,11 +39,8 @@ jobs:
     strategy:
       matrix:
         ruby_version:
-          - "2.7"
           - "3.2"
         include:
-          - ruby-version: '2.7'
-            puppet_gem_version: '~> 7.0'
           - ruby_version: '3.2'
             puppet_gem_version: 'https://github.com/puppetlabs/puppet' # puppet8'
         runs_on:

.github/workflows/nightly.yml

@@ -11,11 +11,8 @@ jobs:
       fail-fast: false
       matrix:
         ruby_version:
-          - "2.7"
           - "3.2"
         include:
-          - ruby-version: '2.7'
-            puppet_gem_version: '~> 7.0'
           - ruby_version: '3.2'
             puppet_gem_version: 'https://github.com/puppetlabs/puppet' # puppet8'
         runs_on:
@@ -34,11 +31,8 @@ jobs:
     strategy:
       matrix:
         ruby_version:
-          - "2.7"
           - "3.2"
         include:
-          - ruby-version: '2.7'
-            puppet_gem_version: '~> 7.0'
           - ruby_version: '3.2'
             puppet_gem_version: 'https://github.com/puppetlabs/puppet' # puppet8'
         runs_on:

puppet-modulebuilder.gemspec

@@ -29,5 +29,5 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'voxpupuli-rubocop', '~> 3.0.0'
 
-  spec.required_ruby_version = Gem::Requirement.new('>= 2.7.0')
+  spec.required_ruby_version = Gem::Requirement.new('>= 3.1.0')
 end