Update isort requirement from ==5.12.0 to ==5.13.2 #6026

Job	Run time
Build, test and upload wheel	1m 22s
Framework / bare	1m 55s
Framework / bare-https	1m 15s
Strategy / FedMedian	1m 12s
Framework / jax	2m 8s
Strategy / FedTrimmedAvg	1m 9s
Framework / pytorch	2m 40s
Strategy / QFedAvg	1m 21s
Framework / tensorflow	3m 13s
Strategy / FaultTolerantFedAvg	1m 26s
Framework / tabnet	2m 50s
Strategy / FedAvgM	1m 6s
Framework / opacus	2m 45s
Strategy / FedAdam	1m 13s
Framework / pytorch-lightning	2m 40s
Strategy / FedAdagrad	1m 7s
Framework / mxnet	1m 37s
Strategy / FedYogi	1m 4s
Framework / scikit-learn	2m 27s
Framework / fastai	4m 14s
Framework / pandas	1m 38s
	40m 22s

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