[rocm-libraries] ROCm/rocm-libraries#7471 (commit 13b9eec)

[CK] increase timeout limit for fmha_fwd tests to avoid CI failure on gfx11 (#7471)

## Motivation

This should prevent fmha_fwd tests from timing out on one of the slower
gfx11 CI nodes and generating false CI failures.

## Technical Details

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## Test Plan

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## Test Result

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## Submission Checklist

- [ ] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.