[main] (deps): Bump dotnet/arcade/.github/workflows/backport-base.yml (#64912)

Bumps [dotnet/arcade/.github/workflows/backport-base.yml](https://github.com/dotnet/arcade) from 47a8a69721dfea57b82121ac1458d2f5bba6abd2 to 47888ab45fbdd0e6c0fe5e7f82eb1fe47cd7b7f0.
- [Commits](https://github.com/dotnet/arcade/compare/47a8a69721dfea57b82121ac1458d2f5bba6abd2...47888ab45fbdd0e6c0fe5e7f82eb1fe47cd7b7f0)

---
updated-dependencies:
- dependency-name: dotnet/arcade/.github/workflows/backport-base.yml
  dependency-version: 47888ab45fbdd0e6c0fe5e7f82eb1fe47cd7b7f0
  dependency-type: direct:production
...

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

.github/workflows/backport.yml

@@ -14,7 +14,7 @@ permissions:
 
 jobs:
   backport:
-    uses: dotnet/arcade/.github/workflows/backport-base.yml@47a8a69721dfea57b82121ac1458d2f5bba6abd2 # 2025-01-13
+    uses: dotnet/arcade/.github/workflows/backport-base.yml@47888ab45fbdd0e6c0fe5e7f82eb1fe47cd7b7f0 # 2025-01-13
     with:
       pr_description_template: |
         Backport of #%source_pr_number% to %target_branch%