fix: correct prompt template for Phi3 Medium model

[louis-jan]

Description

• There was an issue with the Phi-3 Medium prompt template (0.5.3), which lead to a wrong output like this:

• This is the second attempt at correcting the model prompt template, and the result should be like this:

Changes made

1. The model version has been updated from "1.3" to "1.4".

2. The prompt template has been modified:

   • Old: "<|user|> {prompt}<|end|><|assistant|><|end|>"
   • New: "<|user|> {prompt}<|end|><|assistant|>"

   The main difference is the removal of "<|end|>" after "<|assistant|>".

Fixes Issues

• bug: Phi-3 models failing to start with outdated versions #3608

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[github-actions]

Barecheck - Code coverage report

Total: 57.31%

Your code coverage diff: 0.00% ▴

✅ All code changes are covered