gh-41058: remove some deprecated stuff in rings/
after
File: src/sage/rings/polynomial/laurent_polynomial_ring.py ; PR: #35229
closed in 2023
File: src/sage/rings/polynomial/groebner_fan.py ; PR: #33468 closed in
2022
File: src/sage/rings/polynomial/multi_polynomial.pyx ; PR: #32709 closed
in 2023
File: src/sage/rings/number_field/number_field.py ; PR: #33386 closed in
2022
### :memo: Checklist
- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
URL: https://github.com/sagemath/sage/pull/41058
Reported by: Frédéric Chapoton
Reviewer(s):
