Bump martincostello/update-dotnet-sdk (#827)

Bumps [martincostello/update-dotnet-sdk](https://github.com/martincostello/update-dotnet-sdk) from 3b9c628 to df4209b.
- [Release notes](https://github.com/martincostello/update-dotnet-sdk/releases)
- [Commits](3b9c628...df4209b)

---
updated-dependencies:
- dependency-name: martincostello/update-dotnet-sdk
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/update-dotnet-sdk.yml

@@ -229,7 +229,7 @@ jobs:
     # for the same release channel as the SDK specified in global.json.
     - name: Update .NET SDK
       id: update-dotnet-sdk
-      uses: martincostello/update-dotnet-sdk@3b9c6287688e4532f2d749ee4172bdfbfef9ba57 # v3.2.0
+      uses: martincostello/update-dotnet-sdk@df4209bbf7d0b82dd7d0a684ce1b601950061e3c # v3.2.0
       with:
         branch-name: ${{ inputs.branch-name }}
         channel: ${{ inputs.channel }}