Add support for PY3.13; use vendored version of telnetlib #2904

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Job	Run time
std_tests (3.9)	31s
std_tests (3.10.9)	32s
std_tests (3.11)	28s
std_tests (3.12)	31s
std_tests (3.13)	1s
build_docs	0s
	2m 3s