Update facterdb requirement from ~> 3.1 to >= 3.1, < 5.0

Updates the requirements on [facterdb](https://github.com/voxpupuli/facterdb) to permit the latest version.
- [Release notes](https://github.com/voxpupuli/facterdb/releases)
- [Changelog](https://github.com/voxpupuli/facterdb/blob/master/CHANGELOG.md)
- [Commits](voxpupuli/facterdb@3.1.0...3.10.0)

---
updated-dependencies:
- dependency-name: facterdb
  dependency-version: 3.10.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

rspec-puppet-facts.gemspec

@@ -27,5 +27,5 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'deep_merge', '~> 1.2'
   s.add_dependency 'facter', '< 5'
-  s.add_dependency 'facterdb', '~> 3.1'
+  s.add_dependency 'facterdb', '>= 3.1', '< 5.0'
 end