Fix deps for unicode regex compiling

[saroh]

following #1356

Fixes ./example/json_field.rs (which fails with v0.17)

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Syntax(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regex parse error:
    \\(\+|\^|`|:|\{|\}|"|\[|\]|\(|\)|\~|!|\\|\*|\s)
                                                ^^
error: Unicode-aware Perl class not found (make sure the unicode-perl feature is enabled)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
)', /home/saroh/.cargo/git/checkouts/tantivy-1e252d10ffb11ab7/3223bdf/query-grammar/src/query_grammar.rs:29:64

+doc lint

maybe we could add the example somewhere in the doc so they're tested/serve as tests ?

[codecov-commenter]

Codecov Report

Merging #1373 (d7bfed3) into main (3223bdf) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1373      +/-   ##
==========================================
- Coverage   94.23%   94.23%   -0.01%     
==========================================
  Files         234      234              
  Lines       42829    42829              
==========================================
- Hits        40362    40361       -1     
- Misses       2467     2468       +1     

Impacted Files	Coverage Δ
src/collector/multi_collector.rs	99.30% <ø> (ø)
src/fastfield/serializer/mod.rs	91.30% <0.00%> (-1.45%)	⬇️
src/fastfield/reader.rs	89.91% <0.00%> (+0.84%)	⬆️

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[fulmicoton]

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