Update workflow to use Go 1.20

Author: witekest

.github/workflows/github-actions-tests.yml

@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.17.x]
+        go-version: [1.20.x]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -15,4 +15,4 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Test
-        run: go test ./... -cover -race
+        run: go test ./... -cover -race