readme: update ruff badge and link (#192)

README.md

@@ -7,7 +7,7 @@
 [![Supported Python versions](https://img.shields.io/pypi/pyversions/qiskit-aqt-provider.svg)](https://pypi.python.org/pypi/qiskit-aqt-provider)
 ![Build Status](https://github.com/qiskit-community/qiskit-aqt-provider/actions/workflows/poetry.yml/badge.svg?branch=master)
 [![Coverage Status](https://coveralls.io/repos/github/qiskit-community/qiskit-aqt-provider/badge.svg?branch=master)](https://coveralls.io/github/qiskit-community/qiskit-aqt-provider?branch=master)
-[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/charliermarsh/ruff/main/assets/badge/v1.json)](https://github.com/charliermarsh/ruff)
+[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://docs.astral.sh/ruff)
 [![Checked with mypy](https://www.mypy-lang.org/static/mypy_badge.svg)](https://mypy-lang.org/)
 
 [Qiskit](https://www.ibm.com/quantum/qiskit) is an open-source SDK for working with quantum computers at the level of circuits, algorithms, and application modules.