Bump docker/metadata-action from 5.3.0 to 5.5.0 #6469

Job	Run time
Build, test and upload wheel	1m 11s
Framework / bare	1m 40s
Strategy / FedMedian	1m 8s
Framework / bare-https	1m 13s
Strategy / FedTrimmedAvg	1m 10s
Framework / jax	2m 17s
Strategy / QFedAvg	1m 4s
Framework / pytorch	2m 34s
Strategy / FaultTolerantFedAvg	1m 13s
Framework / tensorflow	3m 4s
Strategy / FedAvgM	1m 11s
Framework / tabnet	2m 34s
Framework / opacus	2m 34s
Strategy / FedAdam	1m 12s
Framework / pytorch-lightning	2m 36s
Strategy / FedAdagrad	1m 12s
Framework / scikit-learn	2m 24s
Strategy / FedYogi	1m 3s
Framework / fastai	3m 51s
Framework / pandas	1m 37s
	36m 48s

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