Use `telnetlib3` to replace the now obsolete `telnetlib`. #1931

Job	Run time
XML validation	14s
MSIS code validation (ubuntu-latest)	7s
MSIS code validation (macos-latest)	10s
C/C++ build (MSVC) (ON)	6m 56s
C/C++ build (Linux) (ubuntu-22.04, ON, ON, OFF, ON)	3m 51s
C/C++ build (MSVC) (OFF)	5m 8s
C/C++ build (MacOSX) (macos-12, 3.8)	4m 57s
C/C++ build (Linux) (ubuntu-22.04, ON, OFF, OFF, ON)	3m 41s
C/C++ build (MinGW) (ON)	3m 19s
C/C++ build (MacOSX) (macos-14, 3.10)	3m 29s
C/C++ build (Linux) (ubuntu-22.04, OFF, ON, OFF, ON)	3m 51s
C/C++ build (MinGW) (OFF)	3m 53s
C/C++ build (Linux) (ubuntu-22.04, OFF, OFF, OFF, ON)	4m 10s
C/C++ build (Linux) (ubuntu-20.04, OFF, OFF, ON, OFF)	5m 28s
Build Python Module from Source	0s
Code coverage	1m 56s
Matlab S-Function (macos-12)	12m 53s
Matlab S-Function (ubuntu-22.04)	3m 42s
Matlab S-Function (windows-latest)	6m 47s
Build Python wheels	0s
Build Windows installer	0s
Deploy Stable Release	0s
Deploy Rolling Release	0s
Deploy Documentation	0s
	1h 14m 32s

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