requirements : update transformers/torch for Embedding Gemma (#15828)

* requirements : update transformers/torch for Embedding Gemma

This commit updates the requirements to support converting
Embedding Gemma 300m models.

The motivation for this change is that during development I had a local
copy of the transformers package which is what I used for converting
the models. This was a mistake on my part and I should have also updated
my transformers version to the official release.

I had checked the requirements/requirements-convert_legacy_llama.txt
file and noted that the version was >=4.45.1,<5.0.0 and came to the
conculusion that no updated would be needed, this assumed that
Embedding Gemma would be in a transformers release at the time
Commit fb15d649ed ("llama : add support
for EmbeddingGemma 300m (#15798)) was merged. So anyone wanting to
convert themselves would be able to do so. However, Embedding Gemma is
a preview release and this commit updates the requirements to use this
preview release.

* resolve additional python dependencies

* fix pyright errors in tokenizer test and remove unused import

tools/mtmd/legacy-models/minicpmv-convert-image-encoder-to-gguf.py

@@ -23,7 +23,6 @@ import warnings
 import numpy as np
 import torch
 import torch.nn.functional as F
-import torch.utils.checkpoint
 from torch import nn
 from torch.nn.init import _calculate_fan_in_and_fan_out
 
@@ -413,7 +412,8 @@ import re
 
 import numpy as np
 from gguf import *
-from transformers.models.idefics2.modeling_idefics2 import Idefics2VisionTransformer, Idefics2VisionConfig
+from transformers.models.idefics2.modeling_idefics2 import Idefics2VisionTransformer
+from transformers.models.idefics2.configuration_idefics2 import Idefics2VisionConfig
 
 TEXT = "clip.text"
 VISION = "clip.vision"