bug(medcat): CU-869cqnmtk Fix RelCAT typing issue

[mart-r]

This PR fixes a typing issue in RelCAT.

Was surfaced by the nightly stability workflow:
https://github.com/CogStack/cogstack-nlp/actions/runs/23831367419/job/69465708972

Run uv run --python 3.10 python -m mypy --follow-imports=normal medcat
Uninstalled 1 package in 10ms
Installed 1 package in 2ms
medcat/components/addons/relation_extraction/config.py:20: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/components/addons/relation_extraction/modernbert/model.py:92: error: Cannot access instance-only attribute "pretrained_model_name_or_path" on class object  [misc]
medcat/components/addons/relation_extraction/llama/model.py:221: error: Cannot access instance-only attribute "pretrained_model_name_or_path" on class object  [misc]
medcat/components/addons/relation_extraction/bert/model.py:87: error: Cannot access instance-only attribute "pretrained_model_name_or_path" on class object  [misc]
medcat/plugins/registry.py:33: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/components/ner/trf/transformers_ner.py:366: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:43: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:44: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:45: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:46: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:47: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:48: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:49: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:50: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:51: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/stats/stats.py:52: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
medcat/pipeline/speed_utils.py:142: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
Found 3 errors in 3 files (checked 152 source files)

Honestly not quite sure why this wasn't found before. My best guess is that either transformers changed (e.g in v5 the config is a data class) or mypy had an update.