Bump UmbracoCms.Core from 7.8.1 to 8.5.4 in /NicBell.UCreate

[dependabot[bot]]

Bumps UmbracoCms.Core from 7.8.1 to 8.5.4.

Release notes

Sourced from UmbracoCms.Core's releases.

CodeGarden '18 Snapshot

Version 8 as of CodeGarden '18

Commits

• 6a6978d Merge pull request #7627 from umbraco/v8/bugfix/AB4828-resetpassword-mail
• 9c428b7 Bump version to 8.5.4
• 4cf78d6 Bump version to 8.5.3
• 7bdf97c umbraco/Umbraco-CMS#7469 Unsealed class to allow ov...
• 05fe604 umbraco/Umbraco-CMS#7469 Renamed extension method t...
• 7fbe482 Revert "umbraco/Umbraco-CMS#7469 - Fixed Ambiguous...
• df1e006 Merge pull request #7470 from umbraco/v8/hotfix/7469-ambiguous-extension-method
• baef282 umbraco/Umbraco-CMS#7469 - Fixed Ambiguous extensi...
• 6637bf5 umbraco/Umbraco-CMS#7469 - Fixed Ambiguous extensi...
• 5ddc4b8 Bump version to 8.5.2
• Additional commits viewable in compare view

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