Bump patch version from 13.1.1 to 13.1.2

[Copilot]

Description

Bump patch version from 13.1.1 to 13.1.2 across the release branch:

• eng/Versions.props — PatchVersion 1 → 2
• tests/Shared/RepoTesting/Directory.Packages.Helix.props — All hardcoded package versions
• tests/Shared/RepoTesting/Aspire.RepoTesting.targets — Aspire.AppHost.Sdk version references

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
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
  • No
• Does the change require an update in our Aspire docs?
  • Yes
  • No

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[Copilot]

Pull request overview

Updates the release-branch versioning metadata and Helix/out-of-repo test infrastructure to align with the 13.1.2 patch release across the repo.

Changes:

• Bumped the repo patch version to 13.1.2 via eng/Versions.props.
• Updated hardcoded Aspire package versions used for Helix/out-of-repo testing to 13.1.2.
• Updated Aspire.AppHost.Sdk MSBuild SDK import versions used by repo testing to 13.1.2.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
eng/Versions.props	Bumps PatchVersion to 2 (repo version becomes 13.1.2).
tests/Shared/RepoTesting/Directory.Packages.Helix.props	Updates hardcoded Aspire package versions used in Helix/out-of-repo runs to 13.1.2.
tests/Shared/RepoTesting/Aspire.RepoTesting.targets	Updates Aspire.AppHost.Sdk Sdk.props/Sdk.targets import versions to 13.1.2 for out-of-repo test builds.