Use Ktor version catalog in code snippets

[horatiothomas]

Made this change to make it easier to copy and paste Ktor libraries used in code snippets into projects using the latest Ktor versions

[coderabbitai]

Walkthrough

Changes

The code snippets now share a ktorLibs version catalog. Their Ktor dependencies and selected Ktor Gradle plugin declarations use catalog aliases instead of explicit versions and Maven coordinates.

Dependency catalog migration

Layer / File(s)	Summary
Version catalog foundation codeSnippets/settings.gradle.kts	Adds Maven Central resolution, creates ktorLibs from ktor_version, and suppresses the unstable Gradle API warning.
Snippet dependency migrations codeSnippets/snippets/*/build.gradle.kts	Migrates Ktor libraries and selected plugin declarations to ktorLibs aliases. Unrelated dependencies remain unchanged.

Estimated code review effort: 3 (Moderate) | ~30 minutes

Possibly related PRs

• ktorio/ktor-documentation#798: Updates the Ktor version used by code snippets.
• ktorio/ktor-documentation#812: Also changes codeSnippets dependency management.
• ktorio/ktor-documentation#820: Also migrates tutorial snippet builds to centralized Ktor catalogs.

Suggested reviewers: bjhham

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: migrating code snippets to the Ktor version catalog.
Description check	✅ Passed	The description explains that the change improves reuse of Ktor library declarations with current Ktor versions.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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