Find dates written right after a label and a colon in search_dates

[AdrianAtZyte]

Resolves #771

[codspeed]

Merging this PR will not alter performance

✅ 7 untouched benchmarks

---

_{Comparing AdrianAtZyte:search-colon-label (756db17) with master (13da631)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.89%. Comparing base (13da631) to head (756db17).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1496   +/-   ##
=======================================
  Coverage   98.89%   98.89%           
=======================================
  Files         238      238           
  Lines        3438     3439    +1     
=======================================
+ Hits         3400     3401    +1     
  Misses         38       38           

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[serhii73]

LGTM