[requirements] Add ovos-stt-plugin-vosk to extra-stt.txt

[goldyfruit]

No description provided.

[codecov]

Codecov Report

Merging #202 (c9dfdae) into dev (6ceb058) will increase coverage by 3.84%.
The diff coverage is 36.89%.

@@            Coverage Diff             @@
##              dev     #202      +/-   ##
==========================================
+ Coverage   50.35%   54.20%   +3.84%     
==========================================
  Files         119      156      +37     
  Lines       10077     9771     -306     
==========================================
+ Hits         5074     5296     +222     
+ Misses       5003     4475     -528     

Impacted Files	Coverage Δ
mycroft/audio/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/arduino.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/eyes.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/mouth.py	0.00% <0.00%> (ø)
mycroft/client/speech/__main__.py	0.00% <0.00%> (ø)
mycroft/client/speech/hotword_factory.py	0.00% <0.00%> (-88.89%)	⬇️
mycroft/client/speech/service.py	0.00% <0.00%> (ø)
mycroft/client/speech/silence.py	0.00% <0.00%> (-42.86%)	⬇️
mycroft/client/text/__init__.py	0.00% <0.00%> (ø)
... and 141 more

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