fix cache key in concat oneDNN kernel

[wojtuss]

PR types

Bug fixes

PR changes

OPs

Describe

This patch fixes cache key for oneDNN concat primitive so that the first dimensions of all inputs were taken into account.
It fixes the issue #31111.

[paddle-bot-old]

Thanks for your contribution!
Please wait for the result of CI firstly. See Paddle CI Manual for details.

[juncaipeng]

LGTM

[lidanqing-vv]

@wojtuss Please cherry-pick to 2.0.2

[luotao1]

@wojtuss

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