fix bench for api change

[PSeitz]

running 6 tests
test tests::bench_fastfield_bitpack_create             ... bench:     107,127 ns/iter (+/- 3,858)
test tests::bench_fastfield_bitpack_get                ... bench:       5,182 ns/iter (+/- 52)
test tests::bench_fastfield_linearinterpol_create      ... bench:     245,936 ns/iter (+/- 4,849)
test tests::bench_fastfield_linearinterpol_get         ... bench:       5,199 ns/iter (+/- 80)
test tests::bench_fastfield_multilinearinterpol_create ... bench:     383,690 ns/iter (+/- 6,445)
test tests::bench_fastfield_multilinearinterpol_get    ... bench:      15,421 ns/iter (+/- 359)

[codecov-commenter]

Codecov Report

Merging #1467 (fa0fbc6) into main (998b126) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1467   +/-   ##
=======================================
  Coverage   94.08%   94.08%           
=======================================
  Files         238      238           
  Lines       44517    44517           
=======================================
  Hits        41886    41886           
  Misses       2631     2631           

Impacted Files	Coverage Δ
src/fastfield/reader.rs	87.73% <0.00%> (-0.62%)	⬇️
src/postings/stacker/expull.rs	99.05% <0.00%> (+0.47%)	⬆️

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