test: Loosen tolerance for test_validation[1bin_normsys_mu1]

[matthewfeickert]

Description

Loosen the relative tolerance from ~1e-9 to ~1e-6 to have comparisons with NumPy v1.24.0+ work. A relative tolerance of ~1e-6 is still fine and so this shouldn't be considered a regression.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

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For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Loosen the relative tolerance from ~1e-9 to ~1e-6 to have comparisons with
  NumPy v1.24.0+ work. A relative tolerance of ~1e-6 is still fine and so this
  shouldn't be considered a regression.

[codecov]

Codecov Report

Base: 98.30% // Head: 98.30% // No change to project coverage 👍

Coverage data is based on head (8cfab8a) compared to base (78c0da0).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2085   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          69       69           
  Lines        4531     4531           
  Branches      645      645           
=======================================
  Hits         4454     4454           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	97.88% <ø> (ø)
doctest	61.15% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.8	96.33% <ø> (ø)
unittests-3.9	96.35% <ø> (ø)

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[lukasheinrich]

LGTM