Remove unnecessary step

Author: juancgalvis

.github/workflows/main.yml

@@ -36,8 +36,6 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - name: Retrieve entire repository history
-        run: git fetch --prune --unshallow
       - name: Set up JDK 11
         uses: actions/setup-java@v1
         with: