build(deps): Bump postcss from 8.4.21 to 8.4.31 in /website #8009

Job	Run time
CI Generate Image Tag	1s
CI Test Go (1.20.X)	6m 21s
CI Test JS (16.X)	4m 16s
CI Check Static Checks (1.20.X, 16.X)	7m 4s
release	2s
CI Build Gitops Docker Image (gitops)	3m 16s
CI Build Gitops Docker Image (gitops-server)	4m 1s
Publish js library	1m 32s
PR CI Pipeline	1s
CI Upload Images	0s
Upload Binary	0s
PR CI Pipeline	0s
Notify Slack on Failure	0s
	26m 34s

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