Update libgit2sharp.yml

add fetch depth

Author: lytico

.github/workflows/libgit2sharp.yml

@@ -13,6 +13,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+          fetch-depth: 3
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with: