[code_review] Switch to GPT-4.1

[marco-c]

Fixes #4965

@suhaibmujahid could you run the evaluation?

[suhaibmujahid]

could you run the evaluation?

Here is the report:

--------------------
Variant Name: llm-gpt-4.1
--------------------
New Comments: 316
New Valid Comments: 42
New Invalid Comments: 84
New Unevaluated Comments: 190
--------------------
Old Comments: 272
Old Valid Comments: 83
Old Invalid Comments: 189
--------------------
Recalled comments: 51.10294117647059
Recalled valid comments: 50.602409638554214
Recalled invalid comments: 51.32275132275132
--------------------
Missed valid comments: 49.39759036144578
Missed invalid comments: 48.67724867724868

This can be compared to #4827 (comment):

--------------------
Variant Name: New Filtering
--------------------
New Comments: 520
New Valid Comments: 57
New Invalid Comments: 115
New Unevaluated Comments: 348
--------------------
Old Comments: 272
Old Valid Comments: 85
Old Invalid Comments: 187
--------------------
Recalled comments: 68.38235294117648
Recalled valid comments: 67.05882352941175
Recalled invalid comments: 68.98395721925134
--------------------
Missed valid comments: 32.94117647058823
Missed invalid comments: 31.016042780748666