## Summary
The intent here is that all actions should be pinned to an immutable SHA
(but that Renovate should annotate each SHA with the corresponding
SemVer version).
See https://github.com/astral-sh/uv/pull/12189
## Test plan
```
npx --yes --package renovate -- renovate-config-validator
npm warn deprecated inflight@1.0.6: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
npm warn deprecated rimraf@2.4.5: Rimraf versions prior to v4 are no longer supported
npm warn deprecated boolean@3.2.0: Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.
npm warn deprecated glob@6.0.4: Glob versions prior to v9 are no longer supported
INFO: Validating .github/renovate.json5
INFO: Config validated successfully
```
## Summary
Revert the v4 update for now until the codebase is updated
(https://github.com/astral-sh/ruff/pull/16069).
Update renovate config to disable updating it.
## Test Plan
```console
$ npx --yes --package renovate -- renovate-config-validator
(node:98977) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
INFO: Validating .github/renovate.json5
INFO: Config validated successfully
```
And run `npm run build` in the `playground/` directory.
## Summary
This PR updates the Renovate config to account for the
`requirements*.txt` files in `docs/` directory.
The `mkdocs-material` upgrade is ignored because we use commit SHA for
the insider version and it should match the corresponding public version
as per the docs:
https://squidfunk.github.io/mkdocs-material/insiders/upgrade/
(`9.x.x-insiders-4.x.x`).
## Test Plan
```console
❯ renovate-config-validator
(node:83193) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
INFO: Validating .github/renovate.json5
INFO: Config validated successfully
```
