deps: Bump GitHub.Copilot.SDK from 1.0.28 to 1.0.29 (#2429)

---
updated-dependencies:
- dependency-name: GitHub.Copilot.SDK
  dependency-version: 1.0.29
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Brady Gaster <41929050+bradygaster@users.noreply.github.com>

Author: dependabot[bot]

Directory.Build.props

@@ -13,7 +13,7 @@
       below keeps the Microsoft.Agents.AI.GitHub.Copilot native-payload bridge in sync
       with it, so bumping this one property is enough to move both together.
     -->
-    <SquadCopilotSdkVersion>1.0.28</SquadCopilotSdkVersion>
+    <SquadCopilotSdkVersion>1.0.29</SquadCopilotSdkVersion>
 
     <!--
       Why this override is required: