Remove go get in favour of go install

The use of go get to build and install packages has been removed in the latest version of Go.
It was already deprecated in go 1.16.0

Makefile

@@ -24,7 +24,7 @@ $(BIN):
 	@mkdir -p $@
 $(BIN)/%: | $(BIN) ; $(info $(M) building $(PACKAGE)…)
 	$Q tmp=$$(mktemp -d); cd $$tmp; \
-  		env GO111MODULE=on GOPATH=$$tmp GOBIN=$(BIN) $(GO) get $(PACKAGE) \
+  		env GO111MODULE=on GOPATH=$$tmp GOBIN=$(BIN) $(GO) install $(PACKAGE) \
 		|| ret=$$?; \
   		env GO111MODULE=on GOPATH=$$tmp GOBIN=$(BIN) $(GO) clean -modcache \
         || ret=$$?; \