Generated PFX (.p12) not working with Node v17+ due to RC2 cipher

## Environment

* Operating system (including version): macOS 13.1
* mkcert version (from `mkcert -version`): v1.4.4
* Server (where the certificate is loaded): Node.js v18.12.1
* Client (e.g. browser, CLI tool, or script): Node.js CLI (webpack-dev-server@4.11.1)

## What you did

I'm using the webpack dev server, and prefer to use the PFX method as it only creates a single file on the filesystem.

- Installed CA with `mkcert -install`
- Create new PFX with `mkcert -pkcs12 localhost`
- Run webpack with server config for HTTPS and loading the PFX (.p12) file.

Webpack config:
```
devServer: {
server: {
type: 'https',
options: {
pfx: './localhost.p12',
passphrase: 'changeit'
}
}
}
```

## What went wrong

Webpack is unable to serve with the following error:

```
> webpack serve --color --mode development

[webpack-dev-server] SSL certificate: /Users/bart/myapp/node_modules/.cache/webpack-dev-server/server.pem
[webpack-cli] Error: unsupported
at configSecureContext (node:internal/tls/secure-context:277:15)
at Object.createSecureContext (node:_tls_common:117:3)
at Server.setSecureContext (node:_tls_wrap:1352:27)
at Server (node:_tls_wrap:1211:8)
at new Server (node:https:74:3)
at Object.createServer (node:https:112:10)
at Server.createServer (/Users/bart/myapp/node_modules/webpack-dev-server/lib/Server.js:2443:57)
at Server.initialize (/Users/bart/myapp/node_modules/webpack-dev-server/lib/Server.js:1820:10)
at Server.start (/Users/bart/myapp/node_modules/webpack-dev-server/lib/Server.js:3251:16)
at async Command. (/Users/bart/myapp/node_modules/@webpack-cli/serve/lib/index.js:159:21)
```

In the meantime, I'm using the PEM files approach instead.

Start at the PKCS#12 generation path invoked by `mkcert -pkcs12`; the issue does not name an implementation file or test. Inspect the generated file with `openssl pkcs12 -info -in localhost.p12 -noout`, then verify that Node.js v17+ can load it through the webpack-dev-server HTTPS configuration without the unsupported-cipher error.

Written by the indexing model from the issue text.