fix: Add uv to fix disparity between Dependabot docs articles

[adavis444]

Why:

• GitHub announced Dependabot support for uv in https://github.blog/changelog/2025-03-13-dependabot-version-updates-now-support-uv-in-general-availability/
• f3b8c0a adds uv to data/reusables/dependabot/supported-package-managers.md
• However, uv is not present in content/code-security/dependabot/working-with-dependabot/dependabot-options-reference.md
• This leads to a disparity in the documentation between
  https://docs.github.com/en/code-security/dependabot/ecosystems-supported-by-dependabot/supported-ecosystems-and-repositories (with uv)
  and https://docs.github.com/en/code-security/dependabot/working-with-dependabot/dependabot-options-reference#package-ecosystem- (without uv)
• [Improvement]: Address disparity between Dependabot docs articles repo sync #17448 (#54614) by @am-stead requests that changes in data/reusables/dependabot/supported-package-managers.md are also reflected in content/code-security/dependabot/dependabot-options-reference.md, under the package-ecosystem section.

Closes: #37261

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

Add this line to the package-ecosystem table:

| uv | `uv` | Not applicable |

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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Pull Request Overview

This PR addresses a disparity in the Dependabot documentation by adding the missing "uv" package ecosystem entry to the options reference file.

• Updated the package-ecosystem table to include "uv".
• Aligns the content with the corresponding entry in the reusables documentation file.

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Source	Review	Production	What Changed
code-security/dependabot/working-with-dependabot/dependabot-options-reference.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

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[Sharra-writes]

@adavis444 Ah, I got so caught up in updating labels I forgot to thank you for opening this PR, and to let you know I'd get it put up for review! Sorry about that! I sent it to the team for a look when I updated the labels.

[github-actions]

Thanks for opening a pull request! We've triaged this issue for technical review by a subject matter expert 👀

[jeffwidman]

I don't think Not applicable is quite right, since uv may introduce breaking changes in their next major release and we obviously don't want to promise we'll have immediate support for those...

Given uv is currently on 0.6.12, does v0 make sense?

Suggested change

	| uv | `uv` | Not applicable |
	| uv | `uv` | v0 |