[main] (deps): Bump dotnet/arcade/.github/workflows/backport-base.yml (#64470)

Bumps [dotnet/arcade/.github/workflows/backport-base.yml](https://github.com/dotnet/arcade) from f7629bdbfe6a8a4e7a31dede65a392e1e31815b0 to 70312249bc7f64b6bc9c0387c3cc24541376c829.
- [Commits](dotnet/arcade@f7629bd...7031224)

---
updated-dependencies:
- dependency-name: dotnet/arcade/.github/workflows/backport-base.yml
  dependency-version: 70312249bc7f64b6bc9c0387c3cc24541376c829
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/backport.yml

@@ -14,7 +14,7 @@ permissions:
 
 jobs:
   backport:
-    uses: dotnet/arcade/.github/workflows/backport-base.yml@f7629bdbfe6a8a4e7a31dede65a392e1e31815b0 # 2025-01-13
+    uses: dotnet/arcade/.github/workflows/backport-base.yml@70312249bc7f64b6bc9c0387c3cc24541376c829 # 2025-01-13
     with:
       pr_description_template: |
         Backport of #%source_pr_number% to %target_branch%