chore(deps): update actions/checkout digest to 8f4b7f8

Author: renovate[bot]

.github/workflows/workflow.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: 'Checkout'
-        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b # v3
+        uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3 # v3
 
       - name: Test functions
         run: dotnet test --configuration Release src/Hashflags.Tests