Fix typo

.github/workflows/contributors-to-file.yml

@@ -25,7 +25,7 @@ jobs:
         file_in_repo: app/src/main/res/raw/contributors.txt
         min_commit_count: 5
     - name: Remove gradle-update-robot from contributors (not a person)
-      run: "sed -i 's/^gradle-update-robot$/d' app/src/main/res/raw/contributors.txt"
+      run: "sed -i '/^gradle-update-robot$/d' app/src/main/res/raw/contributors.txt"
     - name: Create Pull Request
       uses: peter-evans/create-pull-request@v8.0.0
       with: