Update gemoji requirement from ~> 3.0 to >= 3, < 5 & test with both major versions

[dependabot[bot]]

Updates the requirements on gemoji to permit the latest version.

Release notes

Sourced from gemoji's releases.

gemoji 4.0.0

What's New

Warning See the v4.0.0.pre0 release notes for the list of breaking changes since gemoji v3.x.

• Add skin tones support by @​mislav in github/gemoji#165 ✌🏻✌🏼✌🏽✌🏾✌🏿

  • Emoji.find_by_unicode() now recognizes emoji sequences with skin tone modifiers.
  • Emoji::Character#skin_tones? returns true when an emoji supports skin tone modifiers.
  • Emoji::Character#raw_skin_tone_variants generates a list of all 5 skin tone variants for an emoji.

• Import Emoji 13.0 characters by @​chvp in github/gemoji#173

• Import Emoji 13.1 characters by @​franciscorode in github/gemoji#209

• Import Emoji 14.0 characters by @​kardeslik in github/gemoji#244

What's Changed

• Fix ArgumentError in emoji-test-parser by @​JuanitoFatas in github/gemoji#169
• Remove underscore from "piñata" by @​PurpleBooth in github/gemoji#182
• Safely transliterate international characters for aliases by @​PurpleBooth in github/gemoji#181
• Sort out envelope and email aliases by @​jobveldhuis in github/gemoji#185
• Set up CI via GitHub Actions by @​mislav in github/gemoji#183 github/gemoji#252
• Touch up emoji integrity tests by @​mislav in github/gemoji#253

New Contributors

• @​JuanitoFatas made their first contribution in github/gemoji#169
• @​chvp made their first contribution in github/gemoji#173
• @​PurpleBooth made their first contribution in github/gemoji#182
• @​jobveldhuis made their first contribution in github/gemoji#185
• @​franciscorode made their first contribution in github/gemoji#209
• @​kardeslik made their first contribution in github/gemoji#244

Full Changelog: https://github.com/github/gemoji/compare/v4.0.0.pre0...v4.0.0

Commits

• ac35c33 gemoji 4.0.0
• 70eb18c Merge pull request #165 from github/skin-tones
• d04fd77 Merge pull request #253 from github/tests-refresh
• 744495f Expand skin tones support
• ea4d738 People holding hands emoji doesn't seem to support skin tones rendering (macOS)
• d7ca116 Merge remote-tracking branch 'origin' into skin-tones
• f7a6bb6 :fire: unused variable
• a8d55fd Disallow dashes in new emoji aliases
• 5f3415f Account for the addition of :pregnant_man:
• 9917299 Merge pull request #244 from kardeslik/import-emoji-14
• Additional commits viewable in compare view

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[parkr]

The biggest breaking change here is the removal of github-custom emoji (https://github.com/github/gemoji/pull/158). So we will continue to support gemoji v3 for those that wish to have these older custom emoji. There's also a workaround in that pull request on gemoji's repo.

[parkr]

@jekyllbot: merge +minor