fix #1533 with import update

[subbyte]

https://docs.python.org/3/library/typing.html#typing.TextIO

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (051d6ad) 85.55% compared to head (20209da) 85.55%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1534   +/-   ##
========================================
  Coverage    85.55%   85.55%           
========================================
  Files          682      682           
  Lines        55564    55564           
========================================
  Hits         47536    47536           
  Misses        8028     8028           

Impacted Files	Coverage Δ
...anslation/src/patterns/grammar/STIXPatternLexer.py	100.00% <100.00%> (ø)

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