Minor fixes to boilerplate following usage

Following using the boilerplate to uplift the Photo API in https://gitlab.developers.cam.ac.uk/uis/devops/iam/card-database/photo-api/-/issues/141 there are a couple of backportable fixes that should be introduced to the boilerplate:

• Don't scan python files with editorconfig pre-commit checks, python file format is covered by flake8, black, and isort. In particular, flake8 respects suppressions of e.g. line above maximum length, which the editorconfig will not.
• Update the poetry version used by the poetry-check pre-commit hook - this is still on v1 and causes failures on any project using poetry v2. New projects will use v2 - as the Dockerfile doesn't pin the version installed.