chore: bump up the test timeout to 10m

We seem to be hitting `*** Test killed: ran too long (7m0s)` for the
functional test(s), and whilst I do see a large number of hung
goroutines in the backtrace, I can also see that it is mid teardown of
the docker containers, so it seems to have finished the actual testing
and might just be taking longer than usual to `docker stop` the kafka
containers.

Makefile

@@ -2,7 +2,7 @@ default: fmt get update test lint
 
 GO       := go
 GOBUILD  := CGO_ENABLED=0 $(GO) build $(BUILD_FLAG)
-GOTEST   := $(GO) test -gcflags='-l' -p 3 -v -race -timeout 6m -coverprofile=profile.out -covermode=atomic
+GOTEST   := $(GO) test -gcflags='-l' -p 3 -v -race -timeout 10m -coverprofile=profile.out -covermode=atomic
 
 FILES    := $(shell find . -name '*.go' -type f -not -name '*.pb.go' -not -name '*_generated.go' -not -name '*_test.go')
 TESTS    := $(shell find . -name '*.go' -type f -not -name '*.pb.go' -not -name '*_generated.go' -name '*_test.go')