update clickhouse-server image to match production

[mattseddon]

Production is currently running 26.8.

[cloudflare-workers-and-pages]

Deploying datachain-documentation with    Cloudflare Pages

Latest commit:	44280c4
Status:	✅  Deploy successful!
Preview URL:	https://ae93c273.datachain-documentation.pages.dev
Branch Preview URL:	https://update-clickhouse-server.datachain-documentation.pages.dev

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.33%. Comparing base (6dff062) to head (44280c4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #781   +/-   ##
=======================================
  Coverage   87.33%   87.33%           
=======================================
  Files         128      128           
  Lines       11181    11181           
  Branches     1514     1514           
=======================================
  Hits         9765     9765           
  Misses       1041     1041           
  Partials      375      375           

Flag	Coverage Δ
datachain	87.27% <ø> (ø)

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