Telnet tweaks; python3.13 compat

[BrianPugh]

significantly speed up telnet by reducing sleep.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 381 lines in your changes missing coverage. Please review.

Project coverage is 59.61%. Comparing base (f4d54fc) to head (07ead55).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
belay/telnetlib.py	0.00%	381 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #173       +/-   ##
===========================================
- Coverage   73.89%   59.61%   -14.29%     
===========================================
  Files          38       39        +1     
  Lines        1632     2013      +381     
  Branches      362      428       +66     
===========================================
- Hits         1206     1200        -6     
- Misses        338      724      +386     
- Partials       88       89        +1     

Flag	Coverage Δ
unittests	59.56% <0.00%> (-14.09%)	⬇️

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