build: upgrade to go 1.18 and dependencies

refs robocars/robocar-setup#3

vendor/gocv.io/x/gocv/Dockerfile-test.gpu-cuda-11

@@ -4,7 +4,7 @@
 # To run tests:
 #   docker run -it --rm --gpus all gocv-test-gpu-cuda-11
 #
-FROM gocv/opencv:4.5.4-gpu-cuda-11 AS gocv-gpu-test-cuda-11
+FROM gocv/opencv:4.5.5-gpu-cuda-11 AS gocv-gpu-test-cuda-11
 
 ENV GOPATH /go
 ENV PATH="${PATH}:/go/bin"