Update tinymce-rails requirement from ~> 5.0 to >= 5, < 8

[dependabot[bot]]

Updates the requirements on tinymce-rails to permit the latest version.

Commits

• 9175b3c Update README to refer to main branch as TinyMCE 7
• 13d3bcc Update to TinyMCE 7.0.0
• 6fae921 Fix asset manifest loading when a specific JSON manifest path is provided
• 1d6d6dd Update to TinyMCE 6.8.3
• a45ac0b Update to TinyMCE 6.8.2
• 9a65794 Update to TinyMCE 6.8.1
• 4556e86 Update to TinyME 6.8.0
• e6d28e6 Update to TinyMCE 6.7.2
• 3d52ea3 Add GitHub action workflow for Rails 7.1
• 2ba937b Update to TinyMCE 6.7.1
• Additional commits viewable in compare view

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