update pytest-servers to 0.5.7

[mattseddon]

pytest-servers was running on an old (now incompatible) version of Azurite.

Failures shown:

• https://github.com/iterative/datachain/actions/runs/10911782719
• https://github.com/iterative/datachain/actions/runs/10911782712

[cloudflare-workers-and-pages]

Deploying datachain-documentation with    Cloudflare Pages

Latest commit:	b0df2f8
Status:	✅  Deploy successful!
Preview URL:	https://651f6f1e.datachain-documentation.pages.dev
Branch Preview URL:	https://update-pytest-servers.datachain-documentation.pages.dev

View logs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.69%. Comparing base (80f4fbe) to head (b0df2f8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #454   +/-   ##
=======================================
  Coverage   86.69%   86.69%           
=======================================
  Files          92       92           
  Lines        9789     9789           
  Branches     2019     2019           
=======================================
  Hits         8487     8487           
  Misses        946      946           
  Partials      356      356           

Flag	Coverage Δ
datachain	86.63% <ø> (ø)

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