Remove Gopkg usage in github action

.github/workflows/tests.yml

@@ -37,10 +37,6 @@ jobs:
     - name: Get go dependencies
       run: |
         go get -v -t -d ./...
-        if [ -f Gopkg.toml ]; then
-            curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
-            dep ensure
-        fi
 
     - name: Build and Test
       run: make test