Tag release v2.5.12

[DavisRayM]

Changes / Features implemented

• Ignore form permissions when an Export is from a public form. PR Ignore form permissions when an Export is from a public form #2164 [@DavisRayM]
• Fix charts group by multiple fields and check content type. PR Fix charts groupby multiple fields and check content type  #2151 [@LeonRomo]
• Fix CSV import overwrite which only updated the soft-deleted submissions. PR Csv import overwrite enabled #2166 [@denniswambua]
• Use auth user model for _submitted_by field stats query. PR Use auth user model for _submitted_by field #2167 [@denniswambua]
• Bump ona-oidc version to 86d8cd. PR Bump ona-oidc version to 86d8cd #2169 [@DavisRayM]
• Default response format to JSON for the Charts endpoint. PR Default response format to JSON #2170 [@DavisRayM]

Steps taken to verify this change does what is intended

• QA

Side effects of implementing these changes

• XForm permissions will be ignored for exports made for public XForms
• CSV Import override functionality will now always re-create an Instance; It will not take into account the previously imported UUID
• The chart endpoint will default to a JSON response if the requested format is not supported