Update MNN to 2.9.6

[tunmx]

No description provided.

[devloai]

PR Summary:

This PR updates the MNN version requirement in the README documentation from "1.4.0 or higher" to "2.x or higher". MNN is a critical dependency as one of InspireFace's primary inference backends for face recognition operations.

Review Summary:

Reviewed the version requirement change and identified a potential compatibility issue. Based on research of the official MNN repository releases, the current MNN release series is 3.x (with 3.2.x being the latest), and the "2.x or higher" specification may exclude valid 3.x versions that users might want to use. The knowledge base emphasizes API compatibility validation as a critical review focus.

Follow-up suggestions:

• @devloai verify which MNN versions are actually tested and supported with InspireFace
• @devloai update the version requirement to properly include all supported MNN versions

[devloai]

The version requirement "2.x or higher" appears inconsistent with actual MNN releases. Based on the official MNN repository, the current release series is 3.x (latest: 3.2.x), and there's no evidence of a 2.9.6 version existing in the release history.

The change suggests updating from 1.4.0+ to 2.x+, but this creates a gap where valid 3.x versions would not be covered by this requirement.

Consider either:

1. "MNN (version 3.x or higher)" if targeting the current release series
2. "MNN (version 2.0 or higher)" if you specifically need features from 2.x+ that aren't in 1.x

Please verify which MNN versions are actually supported and tested with InspireFace.

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[tunmx]

After testing, MNN 2.9.6 encountered errors in the armv7 architecture of this project and is temporarily closed