remove cgo_enable flag for the test step

this was a last-minute change that actually isn't needed. we'll know whether this is an issue in the build step anyway.

.github/workflows/pull-request.yml

@@ -47,7 +47,7 @@ jobs:
           go-version: 1.15.x
       - name: Run tests
         run: |
-          CGO_ENABLED=0 go test -v -coverprofile=coverage.out -covermode=atomic ./...
+          go test -v -coverprofile=coverage.out -covermode=atomic ./...
       - name: Publish coverage
         uses: codecov/codecov-action@v1
         with: