Update some references to the old repo org (#9233)

Need https://github.com/pkgxdev/pantry/issues/4531 before we can update
at
af88ffc57e/docs/installation.md (L30-L31)

CONTRIBUTING.md

@@ -337,7 +337,7 @@ We use an experimental in-house tool for managing releases.
         uploaded anything, you can restart after pushing a fix.
     1. Upload to PyPI.
     1. Create and push the Git tag (as extracted from `pyproject.toml`). We create the Git tag only
-        after building the wheels and uploading to PyPI, since we can't delete or modify the tag ([#4468](https://github.com/charliermarsh/ruff/issues/4468)).
+        after building the wheels and uploading to PyPI, since we can't delete or modify the tag ([#4468](https://github.com/astral-sh/ruff/issues/4468)).
     1. Attach artifacts to draft GitHub release
     1. Trigger downstream repositories. This can fail non-catastrophically, as we can run any
         downstream jobs manually if needed.
@@ -346,7 +346,7 @@ We use an experimental in-house tool for managing releases.
     1. Copy the changelog for the release into the GitHub release
         - See previous releases for formatting of section headers
     1. Generate the contributor list with `rooster contributors` and add to the release notes
-1. If needed, [update the schemastore](https://github.com/charliermarsh/ruff/blob/main/scripts/update_schemastore.py).
+1. If needed, [update the schemastore](https://github.com/astral-sh/ruff/blob/main/scripts/update_schemastore.py).
     1. One can determine if an update is needed when
         `git diff old-version-tag new-version-tag -- ruff.schema.json` returns a non-empty diff.
     1. Once run successfully, you should follow the link in the output to create a PR.

playground/src/Editor/SettingsEditor.tsx

@@ -24,7 +24,7 @@ export default function SettingsEditor({
     monaco?.languages.json.jsonDefaults.setDiagnosticsOptions({
       schemas: [
         {
-          uri: "https://raw.githubusercontent.com/charliermarsh/ruff/main/ruff.schema.json",
+          uri: "https://raw.githubusercontent.com/astral-sh/ruff/main/ruff.schema.json",
           fileMatch: ["*"],
           schema,
         },