Upgrade SAI API version from 1.9.0 to 1.12.0

[devin-ai-integration]

Upgrade SAI API version from 1.9.0 to 1.12.0

Summary

This PR upgrades the minimum required SAI (Switch Abstraction Interface) API version from 1.9.0 to 1.12.0 across the codebase. The upgrade implements the recommendation documented in configure.ac (lines 250-263) to use SAI v1.12.0 for full struct binary backward compatibility, particularly for next hop group API and ACL capability data structures.

Changes made:

• Updated compile-time version check in configure.ac (line 264)
• Updated runtime version check in syncd/VendorSai.cpp (line 135)
• Updated SAI submodule to v1.12.0 (commit 3ff228a7)

Review & Testing Checklist for Human

⚠️ Important: This is a breaking change for systems/vendors that don't support SAI v1.12.0 or higher.

• Verify SAI submodule commit: Confirm that commit 3ff228a7 corresponds to the v1.12.0 tag in the SAI repository
• Check CI passes: Ensure all build, lint, and test steps complete successfully, especially SAI-related checks
• Production impact assessment: Verify that all target vendor libraries and production systems support SAI v1.12.0 or can be upgraded before deploying this change
• Test version enforcement: If possible, test that the runtime check in VendorSai::apiInitialize() correctly rejects libraries below v1.12.0

Test Plan

1. Verify the code compiles with SAI v1.12.0 headers
2. Test that syncd initializes successfully with v1.12.0 vendor libraries
3. Test that syncd correctly rejects vendor libraries with version < 1.12.0
4. Run existing integration tests to ensure no regression

Notes

• This change aligns with the existing codebase recommendation in configure.ac comments
• The upgrade provides full struct binary backward compatibility per SAI PR #1795
• Local build testing was not performed due to pre-existing environment issues (sonic-swss-common library dependencies), relying on CI for verification

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Devin Session: https://app.devin.ai/sessions/0979f12bbd0b4b77bb43d95518d9873b
Requested by: Arthur Poon (@arthurkkp-cog)

[devin-ai-integration]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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