feat: silence ConnectionReset errors

[rwakulszowa]

What do these changes do?

The previous implementation would print a verbose error message whenever a session ends:

Traceback (most recent call last):
  File ".../src/aioftp/server.py", line 1013, in dispatcher
    result = task.result()
  File ".../src/aioftp/server.py", line 917, in parse_command
    raise ConnectionResetError
ConnectionResetError

It's not exactly necessary: the (default) logger prints an informative message anyway:

[14:44:51]: [aioftp.server] closing connection from 127.0.0.1:48034

Are there changes in behavior for the user?

Less error-like logs whenever a connection ends

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.90%. Comparing base (4552c2d) to head (7ee7ad7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
- Coverage   97.94%   97.90%   -0.05%     
==========================================
  Files           6        6              
  Lines        2094     2097       +3     
==========================================
+ Hits         2051     2053       +2     
- Misses         43       44       +1     

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[rwakulszowa]

Nevermind, it works fine when the connection is closed cleanly. My bad, wrong testing setup.