sharding: reduce log level for a too spammy message (#3045) #5315

Job	Run time
changes	3s
build-ubuntu-latest	21m 30s
test-ubuntu-latest	29m 25s
build-macos-13	26m 24s
test-macos-13	28m 41s
build-docker-image / docker-build-ubuntu-latest	4m 46s
js-waku-node / node	58m 41s
js-waku-node-optional / node	1m 34s
Lint	35s
	2h 51m 39s

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