Predict correct eltype in decompression benchmarks

[gdalle]

• Decompression benchmarks used to be for a Bool-valued matrix, which prevents caching of decompression memory since the default setting is decompression_eltype=Float64

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3d31ff0) to head (03b3f14).
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           13        13           
  Lines         1611      1611           
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  Hits          1611      1611           

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