v6.7.0

Surrogates v6.7.0

Diff since v6.6.0

Merged pull requests:

• Update wendland.md (#406) (@pnovoa)
• Fix equation formatting in the manual (#432) (@mortenpi)
• CompatHelper: bump compat for Documenter to 1 for package docs, (keep existing compat) (#440) (@github-actions[bot])
• Use XGBoost 2 (#443) (@sathvikbhagavan)
• remove Clustering from SurrogatesMOE as it is not used (#444) (@sathvikbhagavan)
• CompatHelper: add new compat entry for Statistics at version 1, (keep existing compat) (#445) (@github-actions[bot])
• Bump QMC to 0.3 and fix tests (#446) (@ashutosh-b-b)
• Fix equations displaying in benchmarks (#447) (@ErikQQY)
• typos CI (#450) (@ArnoStrouwen)
• Bump actions/checkout from 3 to 4 (#451) (@dependabot[bot])