Update simplecov-cobertura requirement from ~> 1.4 to ~> 2.1

[dependabot[bot]]

Updates the requirements on simplecov-cobertura to permit the latest version.

Release notes

Sourced from simplecov-cobertura's releases.

v2.1.0

What's Changed

• Add support for custom report filename by @​jeremiemv in dashingrocket/simplecov-cobertura#26

New Contributors

• @​jeremiemv made their first contribution in dashingrocket/simplecov-cobertura#26

Full Changelog: https://github.com/dashingrocket/simplecov-cobertura/compare/v2.0.0...v2.1.0

2.0.0

• Branch Coverage Support (#20)
• Don't add empty classes (#18)
• Support for Ruby 3.0 (#20, #21)
• Removed support for Ruby <2.5

Commits

• 02d6cfa Prep for 2.1.0 release
• 487bfaf Delete .ruby-version
• f0199fc Add support for custom report filename (#26)
• fb3f66b Prep version for next dev cycle
• e403741 Prep for release
• 177f396 Replaced build badge
• 17d1fcd GitHub actions (#25)
• 8933b19 Removed notice of branch support limitation
• 2ff4404 Updated Copyright Year
• aedde5d [+] branch coverage & ruby 3.0.2 support. (#20)
• Additional commits viewable in compare view

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