fix(learn): env var tutorial link to latest docs

Adjust the link in the "How to read environment variables from Node.js"
tutorial to refer to the latest version of the API docs and not
arbitrarily link to Node.js 22's docs.

Fixes #7995

Author: mureinik

apps/site/pages/en/learn/command-line/how-to-read-environment-variables-from-nodejs.md

@@ -27,7 +27,7 @@ console.log(process.env.USER_KEY); // "foobar"
 
 In the same way you can access any custom environment variable you set.
 
-Node.js 20 introduced **experimental** [support for .env files](https://nodejs.org/dist/latest-v22.x/docs/api/cli.html#--env-fileconfig).
+Node.js 20 introduced **experimental** [support for .env files](https://nodejs.org/dist/latest/docs/api/cli.html#--env-fileconfig).
 
 Now, you can use the `--env-file` flag to specify an environment file when running your Node.js application. Here's an example `.env` file and how to access its variables using `process.env`.