[release/13.3] Bump patch version from 13.3.3 to 13.3.4

[Copilot]

Description

Prepares the next 13.3.x servicing release by bumping the patch version. Mirrors #17088 (13.3.2 → 13.3.3).

• eng/Versions.props: PatchVersion 3 → 4
• tests/Shared/RepoTesting/Aspire.RepoTesting.targets: Aspire.AppHost.Sdk Sdk.props/Sdk.targets imports → 13.3.4
• tests/Shared/RepoTesting/Directory.Packages.Helix.props: hardcoded Aspire PackageVersion entries → 13.3.4

Diff shape (3 files, 74/74) matches #17088 exactly.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire.dev issue:
      • New issue
  • No

[Copilot]

Pull request overview

Prepares the next 13.3.x servicing release by moving the repo and Helix/out-of-repo test package pins from 13.3.3 to 13.3.4.

Changes:

• Bumps the repository patch version to 13.3.4.
• Updates out-of-repo AppHost SDK imports to 13.3.4.
• Updates Helix package version pins for Aspire packages to 13.3.4.

Show a summary per file

File	Description
eng/Versions.props	Updates PatchVersion from 3 to 4.
tests/Shared/RepoTesting/Aspire.RepoTesting.targets	Updates AppHost SDK Sdk.props/Sdk.targets imports to 13.3.4.
tests/Shared/RepoTesting/Directory.Packages.Helix.props	Updates hardcoded Aspire package pins used by Helix/out-of-repo tests to 13.3.4.

Copilot's findings

• Files reviewed: 3/3 changed files
• Comments generated: 0

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 17215

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 17215"