Recently uploaded labels do not meet color contrast accessibility requirements

[rjkati]

Descriptive summary

On dev.nurax.samvera.org (Hyrax 5.0.0), the Keywords and Depositor labels on the Recently uploaded tab do not meet WCAG AA minimum color contrast requirements

Steps to reproduce the behavior in User Interface (UI)

1. In Chrome, download the Site Improve browser extension
2. Go to dev.nurax.samvera.org and click on the Recently Uploaded link
3. Run the Site Improve browser extension

Rationale

Hyrax (and nurax) should be accessible to users out of the box.

[rkuehn-uofl]

Recommend changing .recent-label from #6c757d to #434C54 (~/app/assets/stylesheets/hyrax/_recent.scss - line 24)