docs: fix broken Learn YAML in five minutes link (#44227)

[anxovatomica]

Issue

Closes #44227

Problem

The Learn YAML in five minutes link on the dependabot.yml file documentation page redirects to a bad/outdated page.

Fix

Changed the link from https://www.codeproject.com/Articles/1214409/Learn-YAML-in-five-minutes to https://learnxinyminutes.com/yaml/

File

• content/code-security/concepts/supply-chain-security/about-the-dependabot-yml-file.md

Checklist

• Verified broken link
• Applied minimal fix with correct replacement URL

[github-actions]

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Source	Review	Production	What Changed
code-security/concepts/supply-chain-security/about-the-dependabot-yml-file.md	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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