Apply automatic formatting (#474)

.docstr.yaml

.github/workflows/codeql-analysis.yml

.github/workflows/linting_and_unittests.yml

.github/workflows/pre-commit.yml

.github/workflows/publish-to-test-pypi.yml

.pre-commit-config.yaml

CONTRIBUTING.md

LICENSE

README.md

RELEASE

bibtexparser/__init__.py

bibtexparser/entrypoint.py

bibtexparser/exceptions.py

bibtexparser/library.py

bibtexparser/middlewares/__init__.py

bibtexparser/middlewares/enclosing.py

bibtexparser/middlewares/interpolate.py

bibtexparser/middlewares/latex_encoding.py

bibtexparser/middlewares/middleware.py

bibtexparser/middlewares/month.py