Fix memory reqs for load stream

[slice4e]

Adjusted the memory requirements for a few test cases.

[codecov-commenter]

Codecov Report

Base: 58.23% // Head: 58.27% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (0c5cef5) compared to base (b7a4f24).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
+ Coverage   58.23%   58.27%   +0.03%     
==========================================
  Files          24       24              
  Lines        2088     2090       +2     
==========================================
+ Hits         1216     1218       +2     
  Misses        872      872              

Impacted Files	Coverage Δ
redis_benchmarks_specification/__runner__/args.py	100.00% <100.00%> (ø)
...edis_benchmarks_specification/__runner__/runner.py	69.04% <100.00%> (+0.08%)	⬆️

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