chore: update release-sdk action to use 'legacy' workflow version (#308)

Author: mohnoor94

.github/workflows/generate-and-publish-sdk-sources.yaml

@@ -12,7 +12,6 @@ on:
       sdk_repo_ref:
         description: |
           Branch or tag to checkout on the `expediagroup-java-sdk` repository.
-          Leave empty to use the default branch (legacy).
         type: string
         default: 'legacy'
 

.github/workflows/release-sdk.yaml

@@ -22,7 +22,7 @@ jobs:
 #      jdk: ${{ matrix.jdk }}
 
   release-sdk:
-    uses: ExpediaGroup/expediagroup-java-sdk/.github/workflows/selfserve-release-sdk.yaml@v20250415
+    uses: ExpediaGroup/expediagroup-java-sdk/.github/workflows/selfserve-release-sdk.yaml@legacy
 #    needs: [ run-examples ]
     secrets: inherit
     with: