Fix ollama segfault

[acroca]

Description

We're having multiple issues with ollama segfaults, like this one
In this PR:

• Pin ollama to the current latest version
• Add a suggested workaround for the segfaults issues.

I've run the validate step 26 times in the CI and none of the runs failed due to ollama sigfault.

[Copilot]

Pull request overview

This PR updates the CI workflow to reduce Ollama-related segfaults by pinning the Ollama binary to a specific upstream release and applying a temporary workaround intended to avoid crashing CPU backends on certain GitHub runners.

Changes:

• Pin Ollama download URL to v0.32.0 instead of using the latest release asset.
• Remove the Sapphire Rapids CPU backend shared library to force a safer fallback backend during CI runs.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.78%. Comparing base (a9445f9) to head (7bb71c0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1161   +/-   ##
=======================================
  Coverage   82.78%   82.78%           
=======================================
  Files         123      123           
  Lines       10127    10127           
=======================================
  Hits         8384     8384           
  Misses       1743     1743           

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