[202412][Mellanox] Update SAI version to SAIBuild2412.5.31.0 (sonic-net#942)

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#### Why I did it

Update SAI Version to SAIBuild2412.5.31.0

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it

Up[date Makefile

#### How to verify it

Run sonic-mgmt regression

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Author: dprital

platform/mellanox/mlnx-sai.mk

@@ -1,6 +1,6 @@
 # Mellanox SAI
 
-MLNX_SAI_VERSION = SAIBuild2412.31.0.2
+MLNX_SAI_VERSION = SAIBuild2412.5.31.0
 MLNX_SAI_ASSETS_GITHUB_URL = https://github.com/Mellanox/Spectrum-SDK-Drivers-SONiC-Bins
 MLNX_SAI_ASSETS_RELEASE_TAG = sai-$(MLNX_SAI_VERSION)-$(BLDENV)-$(CONFIGURED_ARCH)
 MLNX_SAI_ASSETS_URL = $(MLNX_SAI_ASSETS_GITHUB_URL)/releases/download/$(MLNX_SAI_ASSETS_RELEASE_TAG)