🐛 Fixed several issues with multiplexing #159

Job	Run time
package	42s
macOS 3.7	15m 55s
Windows 3.7	3m 14s
Ubuntu 20.04 (OpenSSL 1.1.1) 3.7	2m 38s
Ubuntu Latest (OpenSSL 3+) 3.7	2m 33s
macOS 3.8	16m 2s
Windows 3.8	3m 16s
Ubuntu 20.04 (OpenSSL 1.1.1) 3.8	2m 58s
Ubuntu Latest (OpenSSL 3+) 3.8	2m 33s
macOS 3.9	17m 38s
Windows 3.9	3m 15s
Ubuntu 20.04 (OpenSSL 1.1.1) 3.9	2m 37s
Ubuntu Latest (OpenSSL 3+) 3.9	2m 48s
macOS 3.10	16m 35s
Windows 3.10	3m 44s
Ubuntu 20.04 (OpenSSL 1.1.1) 3.10	2m 57s
Ubuntu Latest (OpenSSL 3+) 3.10	2m 40s
macOS 3.11	22m 52s
Windows 3.11	3m 48s
Ubuntu 20.04 (OpenSSL 1.1.1) 3.11	2m 46s
Ubuntu Latest (OpenSSL 3+) 3.11	3m 14s
macOS 3.12	17m 42s
Windows 3.12	4m 48s
Ubuntu 20.04 (OpenSSL 1.1.1) 3.12	5m 21s
Ubuntu Latest (OpenSSL 3+) 3.12	3m 37s
Ubuntu Latest (OpenSSL 3+) pypy-3.7 test-pypy	5m 0s
Ubuntu Latest (OpenSSL 3+) pypy-3.8 test-pypy	5m 52s
Ubuntu Latest (OpenSSL 3+) pypy-3.9 test-pypy	7m 38s
Ubuntu Latest (OpenSSL 3+) pypy-3.10 test-pypy	7m 14s
Ubuntu Latest (OpenSSL 3+) 3.x test_brotlipy	2m 18s
Ubuntu 20.04 (OpenSSL 1.1.1) 3.9.2 test-3.9	1m 57s
coverage	7s
	3h 16m 19s

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