Fix flaky adaptive localization test by increasing the ensemble size

[kvashchuka]

Issue
Resolves #6462

Approach
Short description of the approach

(Screenshot of new behavior in GUI if applicable)

Pre review checklist

• Read through the code changes carefully after finishing work
• Make sure tests pass locally (after every commit!)
• Prepare changes in small commits for more convenient review (optional)
• PR title captures the intent of the changes, and is fitting for release notes.
• Updated documentation
• Ensured that unit tests are added for all new behavior (See
  Ground Rules),
  and changes to existing code have good test coverage.

Pre merge checklist

• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.

[Blunde1]

LGTM

[tommyod]

Please seed the numpy number generator:

ert/tests/unit_tests/analysis/test_adaptive_localization.py

Line 106 in 65b5e23

cutoff1 = np.random.uniform(0, 1)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4f2fdcc) 83.53% compared to head (b0faa2b) 83.52%.
Report is 131 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6485      +/-   ##
==========================================
- Coverage   83.53%   83.52%   -0.01%     
==========================================
  Files         343      345       +2     
  Lines       20759    20705      -54     
  Branches      938      948      +10     
==========================================
- Hits        17340    17294      -46     
+ Misses       3128     3117      -11     
- Partials      291      294       +3     

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