[Bugfix] fix import youtube allowed netlocks by defining them locally

[deven298]

Description

As title suggests

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Maintainer Checklist

• closes ImportError: cannot import name 'ALLOWED_NETLOCK' from 'langchain.document_loaders.youtube' #1064
• Made sure Checks passed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7444f59) 55.56% compared to head (b16d49c) 57.14%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1191      +/-   ##
==========================================
+ Coverage   55.56%   57.14%   +1.57%     
==========================================
  Files         143      143              
  Lines        5712     5712              
==========================================
+ Hits         3174     3264      +90     
+ Misses       2538     2448      -90     

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