v2.8.0 Drop Ruby 3.2 support & update type gems

What's Changed

• Drop Ruby 3.2 support by @mokuzon in #801
  • Ruby 3.2 was EOL on 2025-03-31.
• Update dependency rbs to v4 by @renovate[bot] in #778
  • More strict type checking available by rbs 4.0 & steep 2.0.0.

line-openapi updates

• Make body in setRichMenuImage required by @github-actions[bot] in #793

Dependency updates

• Update rubygems/release-gem action to v1.2.0 by @renovate[bot] in #792
• Update ruby/setup-ruby action to v1.300.0 by @renovate[bot] in #794
• Update dependency rubocop to v1.86.1 by @renovate[bot] in #795
• Update dependency yard to v0.9.39 by @renovate[bot] in #796
• Update actions/upload-pages-artifact action to v5 by @renovate[bot] in #797
• Update actions/github-script action to v9 by @renovate[bot] in #798
• Update dependency yard to v0.9.42 [SECURITY] by @renovate[bot] in #799
• Update ruby/setup-ruby action to v1.301.0 by @renovate[bot] in #800
• Update dependency rake to v13.4.1 by @renovate[bot] in #802
• Update ruby/setup-ruby action to v1.302.0 by @renovate[bot] in #804
• Update dependency yard to v0.9.43 by @renovate[bot] in #805
• Update actions/setup-node action to v6.4.0 by @renovate[bot] in #806
• Update ruby/setup-ruby action to v1.305.0 by @renovate[bot] in #807
• Update dependency irb to '~> 1.18.0' by @renovate[bot] in #809
• Update ruby/setup-ruby action to v1.305.0 by @renovate[bot] in #810
• Update ruby/setup-ruby action to v1.306.0 by @renovate[bot] in #811
• Update openapi-generator-version to v7.22.0 by @renovate[bot] in #812
• Update ruby/setup-ruby action to v1.307.0 by @renovate[bot] in #813

Full Changelog: v2.7.0...v2.8.0

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This release is prepared by @mokuzon