Update supported package managers in documentation

[grimsa]

Why:

Closes: #45148

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

Added 'uv' to the list of supported package managers for the prefix-development configuration to match https://docs.github.com/en/code-security/reference/supply-chain-security/dependabot-options-reference#prefix-development

Tutorial being updated:

Reference:

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.

[github-actions]

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Source	Review	Production	What Changed
code-security/tutorials/secure-your-dependencies/customizing-dependabot-prs.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17

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[Copilot]

Pull request overview

Updates the Dependabot customization tutorial to align with the options reference and resolve #45148.

Changes:

• Adds uv to package managers supporting prefix-development.

[Sharra-writes]

@grimsa Checking to make sure the reference is correct and the tutorial needs to be updated and not the other way around. Hopefully an easy question with a quick answer. 🤞

[grimsa]

Checking to make sure the reference is correct and the tutorial needs to be updated and not the other way around. Hopefully an easy question with a quick answer. 🤞

Yes, uv is supported.

Our dependabot config is:

updates:
  - package-ecosystem: "uv"
    directory: "/"
    registries:
      - github-******
    schedule:
      interval: "weekly"
    commit-message:
      prefix: "fix(deps): [ENS-1928] "
      prefix-development: "chore(deps-dev): [ENS-1928] "

and we had PRs like this: chore(deps-dev): [ENS-1928] bump coverage from 7.14.3 to 7.15.0