docs: Update Ruff badge and links.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

README.md

@@ -17,7 +17,7 @@ Come find us on the [development community chat](https://zulip.com/development-c
 [![GitHub Actions build status](https://github.com/zulip/zulip/actions/workflows/zulip-ci.yml/badge.svg)](https://github.com/zulip/zulip/actions/workflows/zulip-ci.yml?query=branch%3Amain)
 [![coverage status](https://img.shields.io/codecov/c/github/zulip/zulip/main.svg)](https://codecov.io/gh/zulip/zulip)
 [![Mypy coverage](https://img.shields.io/badge/mypy-100%25-green.svg)][mypy-coverage]
-[![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://github.com/astral-sh/ruff)
 [![code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
 [![GitHub release](https://img.shields.io/github/release/zulip/zulip.svg)](https://github.com/zulip/zulip/releases/latest)

docs/contributing/code-style.md

@@ -61,7 +61,7 @@ lint checks in parallel, including:
 - JavaScript ([ESLint](https://eslint.org/),
   [Prettier](https://prettier.io/))
 - Python ([mypy](http://mypy-lang.org/),
-  [ruff](https://github.com/charliermarsh/ruff),
+  [ruff](https://github.com/astral-sh/ruff),
   [Black](https://github.com/psf/black),
   [isort](https://pycqa.github.io/isort/))
 - templates

docs/testing/linters.md

@@ -30,7 +30,7 @@ below will direct you to the official documentation for these projects.
 - [Prettier](https://prettier.io/)
 - [Puppet](https://puppet.com/) (puppet provides its own mechanism for
   validating manifests)
-- [ruff](https://github.com/charliermarsh/ruff)
+- [ruff](https://github.com/astral-sh/ruff)
 - [stylelint](https://github.com/stylelint/stylelint)
 
 Zulip also uses some home-grown code to perform tasks like validating

pyproject.toml

@@ -99,7 +99,7 @@ init_typed = true
 warn_required_dynamic_aliases = true
 
 [tool.ruff]
-# See https://github.com/charliermarsh/ruff#rules for error code definitions.
+# See https://github.com/astral-sh/ruff#rules for error code definitions.
 select = [
     "ANN", # annotations
     "B", # bugbear