Update Phi-3 small medium blog images (#20750)

### Description
<!-- Describe your changes. -->



### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
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src/routes/blogs/accelerating-phi-3-small-medium/+page.svx

@@ -9,7 +9,8 @@ authors:
 authorsLink:
   [
    ]
-image: ''
+image: 'https://freeimage.host/i/JiYKUNe'
+imageSquare: 'https://freeimage.host/i/JiYKUNe'
 url: 'https://onnxruntime.ai/blogs/accelerating-phi-3-small-medium'
 ---