suppress ping message logging in WebsocketManager #29

Job	Run time
build-and-test (ubuntu-latest, Release)	3m 58s
build-and-test (windows-latest, Debug)	5m 0s
build-and-test (ubuntu-latest, Debug)	3m 6s
build-and-test (windows-latest, Release)	8m 12s
build-and-test (macos-latest, Debug)	2m 46s
build-and-test (macos-latest, Release)	3m 13s
	26m 15s

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