Fix unterminated string in Dependabot update-types example

[SurefireStudios]

Why:

Closes:

One yaml copy block in "Controlling dependencies updated by Dependabot" is missing a closing double quote, so it does not parse: - "version-update:semver-patch.

The same string is correctly quoted four other times in the same file, so this is a typo rather than house style.

The block has a copy button, so readers copy a dependabot.yml that Dependabot rejects with a parse error.

What's being changed (if available, include any code snippets, screenshots, or gifs):

Added the missing " — one character, in Allowing specific semantic versioning levels for updates.

The example now parses and matches the sentence below it:

production  -> ['version-update:semver-patch']
development -> ['version-update:semver-minor', 'version-update:semver-patch']

Check off the following:

• 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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Table of review links

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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 a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
code-security/how-tos/secure-your-supply-chain/manage-your-dependency-security/controlling-dependencies-updated.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17

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

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[janiceilene]

Thanks for opening a PR @SurefireStudios ✨ I'll get this triaged for review.

[mchammer01]

Thanks for spotting and fixing this 💖
LGTM 👍🏻

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