deps: go1.18 for integration tests (#101)

Author: RTann

_integration-tests/go.mod

@@ -1,6 +1,6 @@
 module golang.stackrox.io/grpc-http1/_integration-tests
 
-go 1.16
+go 1.18
 
 require (
 	github.com/stretchr/testify v1.8.4
@@ -10,4 +10,19 @@ require (
 	google.golang.org/grpc/examples v0.0.0-20220608152536-584d9cd11a1d
 )
 
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/golang/glog v1.1.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/klauspost/compress v1.10.3 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
+	google.golang.org/genproto v0.0.0-20230306155012-7f2fa6fef1f4 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	nhooyr.io/websocket v1.8.7 // indirect
+)
+
 replace golang.stackrox.io/grpc-http1 => ../