fix(workflow): correct output setting in release-on-tag workflow

Refactored how the release_exists output is set to be compatible with
GitHub Actions syntax. This ensures the workflow reliably detects if
a release already exists, improving the robustness of the release
process.

.github/workflows/release-on-tag.yml

@@ -21,15 +21,14 @@ jobs:
                 repo: context.repo.repo,
                 tag: context.ref.replace('refs/tags/', ''),
               })
-              return { release_exists: 'true' }
+              outputs.release_exists = 'true'
             } catch (error) {
               if (error.status === 404) {
-                return { release_exists: 'false' }
+                outputs.release_exists = 'false'
               } else {
                 throw error
               }
             }
-          outputs: release_exists
 
       - name: Create Release
         if: steps.check_release.outputs.release_exists == 'false'
@@ -42,4 +41,4 @@ jobs:
           draft: false
           prerelease: false
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}