Bump scala-steward-org/scala-steward-action from 2.75.0 to 2.78.0 (#6285)

Pull request: #6285

Author: dependabot[bot]

.github/workflows/scala-steward.yml

@@ -19,6 +19,6 @@ jobs:
           java-version: '17'
           distribution: 'temurin'
 
-      - uses: scala-steward-org/scala-steward-action@v2.75.0
+      - uses: scala-steward-org/scala-steward-action@v2.78.0
         with:
           mill-version: 0.12.1