Upgrade activesupport to ~> 7.0 for Rails 7 compatibility

[Copilot]

activesupport ~> 6.1 is incompatible with Rails 7 apps and has a Ruby 3.2 breakage (Logger::Severity constant no longer auto-loaded). This bumps the dependency floor to ActiveSupport 7.x and aligns all other version constraints with current tooling.

Changes

• activesupport: ~> 6.1 → ~> 7.0
• rake: ~> 12.3 → ~> 13.0 (12.x has Ruby 3.x incompatibilities)
• bundler: ~> 2.2 → ~> 2.4
• required_ruby_version: >= 3.0.6 → >= 3.2.0
• .ruby-version: 3.0.6 → 3.2.3

No application code changes were required — all ActiveSupport APIs used by this gem (deep_transform_keys, camelize, with_indifferent_access, blank?, Array.wrap) are unchanged in Rails 7.

[guanw88]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Merge conflicts resolved in d32c760. The conflicts were in .ruby-version and qualtrics_api.gemspec:

• .ruby-version: kept 3.2.3
• required_ruby_version: kept >= 3.2.0
• bundler: took master's ~> 2.5.23 (more specific)
• rake: kept ~> 13.0 (Ruby 3.x compatible)

[guanw88]

Superseded by #23