build(deps): bump geonetwork/geonetwork-ui-datahub from 2.6.2 to 2.8.1 in /datahub (#59)

Bumps geonetwork/geonetwork-ui-datahub from 2.6.2 to 2.8.1.

---
updated-dependencies:
- dependency-name: geonetwork/geonetwork-ui-datahub
  dependency-version: 2.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

datahub/values.yaml

@@ -4,7 +4,7 @@ image:
   # Check the official image tags to see which is one you need
   # https://hub.docker.com/r/geonetwork/geonetwork-ui-datahub/tags
   repository: geonetwork/geonetwork-ui-datahub
-  tag: 2.6.2
+  tag: 2.8.1
   pullPolicy: IfNotPresent
 
 configuration: