Bump tinymce-rails from 6.0.2 to 6.3.1

[dependabot[bot]]

Bumps tinymce-rails from 6.0.2 to 6.3.1.

Commits

• bc7c6fc Update to TinyMCE 6.3.1
• a68902d Update to TinyMCE 6.3.0
• 4dd040c Update to TinyMCE 6.2.0
• 0cfc22e Update to TinyMCE 6.1.2
• eed034f Update to TinyMCE 6.1.1
• 956defa Support Psych 4.0+ (#288)
• 4a1d7ca Quote keys in generated JS configuration when required (fixes #289)
• e26a2bb Update to TinyMCE 6.1.0
• 4a49bdd Increment version to 6.0.3.1
• 62ae911 Add back missing Sprockets 4 manifest file (#286)
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like tinymce-rails is up-to-date now, so this is no longer needed.