Bump Aspire branding from 13.1 to 13.2 (#13474)

* Initial plan

* Bump Aspire branding from 13.1 to 13.2

Update version and milestone references:
- eng/Versions.props: MinorVersion 1 -> 2
- .github/policies/milestoneAssignment.prClosed.yml: milestone 13.1 -> 13.2

Note: Template files no longer contain version-specific configuration after
the template simplification in commit 959aac9, so no template changes needed.

Co-authored-by: joperezr <[email protected]>

* Update release branch milestone assignment policy for 13.1

Update the milestone assignment policy for the release branch:
- Branch: release/9.4 -> release/13.1
- Milestone: 9.4.2 -> 13.1

This ensures PRs merged to the release/13.1 branch get the correct milestone assigned.

Co-authored-by: joperezr <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: joperezr <[email protected]>

Author: Copilot

.github/policies/milestoneAssignment.prClosed.yml

@@ -16,16 +16,16 @@ configuration:
           branch: main
       then:
       - addMilestone:
-          milestone: 13.1
+          milestone: 13.2
       description: '[Milestone Assignments] Assign Milestone to PRs merged to the `main` branch'
     - if:
       - payloadType: Pull_Request
       - isAction:
           action: Closed
       - targetsBranch:
-          branch: release/9.4
+          branch: release/13.1
       then:
       - removeMilestone
       - addMilestone:
-          milestone: 9.4.2
-      description: '[Milestone Assignments] Assign Milestone to PRs merged to release/9.4 branch'
+          milestone: 13.1
+      description: '[Milestone Assignments] Assign Milestone to PRs merged to release/13.1 branch'

eng/Versions.props

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <!-- This repo version -->
     <MajorVersion>13</MajorVersion>
-    <MinorVersion>1</MinorVersion>
+    <MinorVersion>2</MinorVersion>
     <PatchVersion>0</PatchVersion>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
     <PreReleaseVersionLabel>preview.1</PreReleaseVersionLabel>