ci: update to ansys actions v8 and docs theme (static search)

[RobPasMue]

Description

Updating to actions (v8), Ansys sphinx theme to 1.1 and removing Meilisearch in favor of static search. Also putting an upper limit on protobug 5.28 due to annoying warnings.

Issue linked

None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.83%. Comparing base (2ea5635) to head (28d56a2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1446   +/-   ##
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  Coverage   91.83%   91.83%           
=======================================
  Files          86       86           
  Lines        6880     6880           
=======================================
  Hits         6318     6318           
  Misses        562      562           

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[SMoraisAnsys]

LGTM
Just wondering, what's the reason for the protobuf changes ?

[RobPasMue]

LGTM Just wondering, what's the reason for the protobuf changes ?

Let me explain them later in our weekly meeting. Mostly this annoying warning that you get if you use 5.28.X and the latest grpcio-health-check versions https://github.com/ansys/pyansys-geometry/actions/runs/11119940649/job/30896029319#step:7:1777

There are issues and PRs for solving this on the grpc repo but it's very annoying and users have already complained about getting these warnings. Bottom line - it's not a PyAnsys Geometry issue, it's a dependency issue... but we are impacted.