integration-cli: debug TestPushToCentralRegistryUnauthorized

Seeing some test-failures, which could be due to changes on Docker Hub

    === Failed
    === FAIL: github.com/docker/docker/integration-cli TestDockerCLIPushSuite/TestPushToCentralRegistryUnauthorized (51.08s)
        docker_cli_push_test.go:229: assertion failed: strings.Contains(out, "Retrying") is true

    === FAIL: github.com/docker/docker/integration-cli TestDockerCLIPushSuite (101.49s)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

integration-cli/docker_cli_push_test.go

@@ -232,8 +232,8 @@ func (s *DockerCLIPushSuite) TestPushToCentralRegistryUnauthorized(c *testing.T)
 	const imgRepo = "test/busybox"
 	cli.DockerCmd(c, "tag", "busybox", imgRepo)
 	out, _, err := dockerCmdWithError("push", imgRepo)
-	assert.ErrorContains(c, err, "", out)
-	assert.Assert(c, !strings.Contains(out, "Retrying"))
+	assert.Check(c, is.ErrorContains(err, ""), out)
+	assert.Check(c, !strings.Contains(out, "Retrying"), out)
 }
 
 func getTestTokenService(status int, body string, retries int) *httptest.Server {