perf: fix RegexIdentifier.check regression

[P403n1x87]

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Prerequisites

• Have you read the documentation on contributing? https://github.com/bee-san/pyWhat/wiki/Adding-your-own-Regex

Why do we need this pull request?

It looks like #167 has introduced a performance regression by adding what seems to be an unnecessary deep copy. A shallow dictionary copy seems to work just fine.

Profiling data collected with Austin shows the before/after difference when running test_json_printing3

Before

After

What GitHub issues does this fix?

A performance regression

Copy / paste of output

❯ poetry run pywhat fixtures/file | grep -A 2 -B 1 'Twilio Account SID'
Matched on: ACAQDrnjkGtf3iA46rtwsvRiscvMTCw30l
Name: Twilio Account SID
Exploit: Use the command below to verify that the SID is valid:
  $ curl -X GET 'https://api.twilio.com/2010-04-01/Accounts.json' -u ACAQDrnjkGtf3iA46rtwsvRiscvMTCw30l:[AUTH_TOKEN]
--
Matched on: ACAWIQTrhbtfozp14V6UTmPyMVUMT0fjjg
Name: Twilio Account SID
Exploit: Use the command below to verify that the SID is valid:
  $ curl -X GET 'https://api.twilio.com/2010-04-01/Accounts.json' -u ACAWIQTrhbtfozp14V6UTmPyMVUMT0fjjg:[AUTH_TOKEN]
--
Matched on: ACgkQ8jFVDE9H447pKwD6A5xwUqIDprBzr
Name: Twilio Account SID
Exploit: Use the command below to verify that the SID is valid:
  $ curl -X GET 'https://api.twilio.com/2010-04-01/Accounts.json' -u ACgkQ8jFVDE9H447pKwD6A5xwUqIDprBzr:[AUTH_TOKEN]

[codecov-commenter]

Codecov Report

Merging #218 (a80cabd) into main (b04de11) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #218      +/-   ##
==========================================
- Coverage   92.52%   92.51%   -0.01%     
==========================================
  Files          14       14              
  Lines        1204     1203       -1     
==========================================
- Hits         1114     1113       -1     
  Misses         90       90              

Impacted Files	Coverage Δ
pywhat/regex_identifier.py	92.50% <100.00%> (-0.19%)	⬇️

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[bee-san]

This is super cool 👏🏻