fix: conversion for port number

[Thepowa753]

If reading the port number (for remote can) from a config file, the dict contains a string, that crashes becouse it require an integer.

[codecov]

Codecov Report

Merging #1309 (746524f) into develop (ed124c9) will decrease coverage by 0.06%.
The diff coverage is 90.00%.

@@             Coverage Diff             @@
##           develop    #1309      +/-   ##
===========================================
- Coverage    66.24%   66.18%   -0.07%     
===========================================
  Files           86       86              
  Lines         9009     9019      +10     
===========================================
+ Hits          5968     5969       +1     
- Misses        3041     3050       +9     

[Thepowa753]

I would need some help in figuring out how to fix mypy error No overload variant of "int" matches argument type "object".
I had to add the forcing to int() in 0 < int () < 25565 because otherwise it couldn't find the < operand between int and object. (I think it's because it doesn't take into account the checks made before.)