:bug: fix Channel.send `message` type

[ooliver1]

Changes

• adds: ...
• fixed: fixes #414
• improvements: Uses utils.MessageConvertable for Channel.send's message param.

Check off the following

• [x] I have tested my changes with the current requirements
• [x] My Code follows the pep8 code style.

[ooliver1]

Once again the check failures are not related :sweat_smile:

[codecov[bot]]

Codecov Report

Base: 64.79% // Head: 64.78% // Decreases project coverage by -0.01% :warning:

Coverage data is based on head (09abdd5) compared to base (4072089). Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #518      +/-   ##
==========================================
- Coverage   64.79%   64.78%   -0.02%     
==========================================
  Files         184      184              
  Lines        5993     5994       +1     
==========================================
  Hits         3883     3883              
- Misses       2110     2111       +1     

Impacted Files	Coverage Δ
pincer/objects/guild/channel.py	59.70% <50.00%> (-0.30%)	:arrow_down:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[Sigmanificient]

Ngl i would need to dig into pincer to remember what is a MessageConvertable x)