Relax atomic ordering on connection counter #195

Job	Run time
linting	14s
formatting	7s
build-and-test (ubuntu-latest, stable)	1m 20s
audit	9s
build-and-test (ubuntu-latest, beta)	1m 11s
build-and-test (macos-latest, stable)	2m 20s
build-and-test (macos-latest, beta)	2m 41s
build-and-test (windows-latest, stable)	3m 13s
build-and-test (windows-latest, beta)	2m 44s
build-and-test (ubuntu-latest, nightly)	1m 12s
build-and-test (ubuntu-latest, 1.70.0)	1m 23s
	16m 34s

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