Fix whitespace in inter-branch-merge.yml (#61027)

.github/workflows/inter-branch-merge-flow.yml

@@ -10,4 +10,4 @@ permissions:
 
 jobs:
   Merge:
-    uses: dotnet/arcade/.github/workflows/backport-base.yml@2e09b2a8a74223d25086d947e2d070827f6c556e# 2024-06-24
+    uses: dotnet/arcade/.github/workflows/backport-base.yml@2e09b2a8a74223d25086d947e2d070827f6c556e # 2024-06-24