Update minitar requirement from ~> 0.9 to >= 0.9, < 2.0

Updates the requirements on [minitar](https://github.com/halostatue/minitar) to permit the latest version.
- [Changelog](https://github.com/halostatue/minitar/blob/main/History.md)
- [Commits](halostatue/minitar@v0.9...v0.12)

---
updated-dependencies:
- dependency-name: minitar
  dependency-type: direct:production
...

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

r10k.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'gettext-setup', '>=0.24', '<2.0'
 
   s.add_dependency 'jwt', '>= 2.2.3', '< 3'
-  s.add_dependency 'minitar', '~> 0.9'
+  s.add_dependency 'minitar', '>= 0.9', '< 2.0'
 
   s.add_development_dependency 'rspec', '~> 3.1'