build: extend cluster redshift integration range

[marcpaterno]

Description

Extend the CAMB redshift integration range and increase its sampling density in the cluster mean-mass redshift-richness shear example.
This ensures the background interpolation covers the redshift range needed by the shear calculation.

Type of change

• Bug fix

Checklist

The following checklist will make sure that you are following the code style and
guidelines of the project as described in the
contributing page.

• I have run make pre-commit and fixed any issues
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have 100% test coverage for my changes (please check this after the CI system has verified the coverage)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (b972fc5) to head (26fd633).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #672   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         151      151           
  Lines        8992     8992           
  Branches     1066     1066           
=======================================
  Hits         8992     8992           

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