security-hardening-with-openid-connect: Add missing comma

[Turbo87]

Why:

The JSON snippet was missing a comma after the runner_environment value, making the snippet invalid JSON.

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• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Pull Request Overview

This PR addresses a JSON formatting error by adding a missing comma to a JSON snippet, ensuring the snippet is valid.

• Fixed the JSON snippet to include a required comma after the "runner_environment" value.
• Ensured the document now adheres to correct JSON syntax.

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on the review server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/security-for-github-actions/security-hardening-your-deployments/about-security-hardening-with-openid-connect.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12

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

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[Sharra-writes]

Good catch! Thanks for correcting that for us. I'll get this merged as soon as check are passing. ✨

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