yarn install warnings & errors Rev 4

- supersedes https://github.com/cypress-io/get-windows-proxy/issues/34

## Situation

Attempting to install dependencies with Yarn succeeds and outputs warnings and deprecations. There are currently no vulnerabilities reported. See Logs below.

## Environment

| Component | Version |
| ---------------------------- | ------------------------- |
| Windows | 11, 24H2 |
| Node.js | 22.19.0 LTS |
| Yarn | 1.22.22 |
| Python | 3.13.5 |
| Visual Studio | Community 2022 - 17.14.14 |
| Desktop development with C++ | |

## Steps to reproduce

```shell
git clone https://github.com/cypress-io/get-windows-proxy
cd get-windows-proxy
git clean -xfd # if repeating
yarn --no-lockfile
```

## Logs

```text

$ git clean -xfd # if repeating
yarn --no-lockfile
yarn install v1.22.22
[1/4] Resolving packages...
warning registry-js > prebuild-install > npmlog@4.1.2: This package is no longer supported.
warning registry-js > prebuild-install > npmlog > gauge@2.7.4: This package is no longer supported.
warning registry-js > prebuild-install > npmlog > are-we-there-yet@1.1.7: This package is no longer supported.
[2/4] Fetching packages...
[3/4] Linking dependencies...
warning Workspaces can only be enabled in private projects.
[4/4] Building fresh packages...
Done in 14.24s.
```

## Assessment

### optionalDependencies

| Warning | Implication |
| --------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------- |
| [registry-js@1.16.1](https://github.com/desktop/registry-js/releases/tag/v1.16.1) | uses old prebuild-install@^5.3.5 versions - needs new release. See issue https://github.com/desktop/registry-js/issues/287 |

### devDependencies

No warnings for `devDependencies`

### dependencies

No warnings for `dependencies`

## Background

Yarn is used in [.circleci/config.yml](https://github.com/cypress-io/get-windows-proxy/blob/develop/.circleci/config.yml) with `yarn install` and `yarn test`.