clean testing dependencies

[noviluni]

I removed some unnecessary test dependencies and updated parts of the code.

[codecov]

Codecov Report

Merging #784 into master will decrease coverage by 2.77%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #784      +/-   ##
==========================================
- Coverage   98.34%   95.57%   -2.78%     
==========================================
  Files         231      304      +73     
  Lines        2484     2600     +116     
==========================================
+ Hits         2443     2485      +42     
- Misses         41      115      +74     

Impacted Files	Coverage Δ
dateparser/search/detection.py	94.33% <0.00%> (-1.50%)	⬇️
dateparser/conf.py	100.00% <0.00%> (ø)
dateparser/utils/__init__.py	97.41% <0.00%> (ø)
dateparser/calendars/jalali_parser.py	100.00% <0.00%> (ø)
dateparser/data/numeral_translation_data/cy.py	0.00% <0.00%> (ø)
dateparser/data/numeral_translation_data/my.py	0.00% <0.00%> (ø)
dateparser/data/numeral_translation_data/ta.py	0.00% <0.00%> (ø)
dateparser/data/numeral_translation_data/fr-BE.py	0.00% <0.00%> (ø)
...ateparser/data/numeral_translation_data/zh-Hant.py	0.00% <0.00%> (ø)
dateparser/data/numeral_translation_data/nb.py	0.00% <0.00%> (ø)
... and 73 more

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