Update tests.yml

Author: Reinhard-Pilz-Dynatrace

.github/workflows/tests.yml

@@ -5,10 +5,10 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.15
+      - name: Set up Go 1.16
         uses: actions/setup-go@v1
         with:
-          go-version: 1.15      
+          go-version: 1.16      
       - name: Check out source code
         uses: actions/checkout@v1
       - uses: hashicorp/setup-terraform@v1