ci: remove conflicting option to push benchmark on github pages

[sw360cab]

Just a small fix to allow publication of benchmark on the repository

[sw360cab]

Ref.
https://github.com/benchmark-action/github-action-benchmark?tab=readme-ov-file#external-data-json-path-optional

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.95%. Comparing base (4b3b419) to head (cfb7b17).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2895      +/-   ##
==========================================
- Coverage   60.96%   60.95%   -0.01%     
==========================================
  Files         564      564              
  Lines       75273    75273              
==========================================
- Hits        45889    45885       -4     
- Misses      26015    26018       +3     
- Partials     3369     3370       +1     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gno.land	67.92% <ø> (ø)
gnovm	65.77% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	20.23% <ø> (ø)
tm2	62.07% <ø> (-0.02%)	⬇️

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