update base.image.version post-6.10

[pdurbin]

What this PR does / why we need it:

A normal post release step. See https://guides.dataverse.org/en/6.10/developers/making-releases.html#update-the-container-base-image-version-property

Which issue(s) this PR closes:

• Closes Release 6.10: Update the Container Base Image Version Property (Post-Release) #12084

[coveralls]

coverage: 24.842%. remained the same
when pulling 697904e on 12084-base.image.version-post-6.10
into 326aa5e on develop.

[github-actions]

📦 Pushed preview images as

ghcr.io/gdcc/dataverse:12084-base.image.version-post-6.10

ghcr.io/gdcc/configbaker:12084-base.image.version-post-6.10

🚢 See on GHCR. Use by referencing with full name as printed above, mind the registry name.