In 1.21.2, redstone torches and their derivatives were retextured and remodeled to use a new colour scheme with less yellows, appearing almost pinkish as a result. However, redstone wire’s own colour scheme was not updated to reflect these changes - it still appears noticeably more orange when at power level 15.
This can be even more noticeable in custom resource packs if redstone wire is assigned a new texture or model.
It is not easy to fix this by means of a resource pack as the coloring is hardcoded, and not editable in any model files or colormap textures.
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“It is not easy to fix this by means of a resource pack”
Yes it is you can just slightly change the torch instead and most people will not notice