fix: use go install instead of go get in makefile (cosmos#12435) (#351)

Co-authored-by: Julien Robert <julien@rbrt.fr>

contrib/devtools/Makefile

@@ -57,28 +57,20 @@ tools-stamp: statik runsim
 	# in a row.
 	touch $@
 
-# Install the runsim binary with a temporary workaround of entering an outside
-# directory as the "go get" command ignores the -mod option and will polute the
-# go.{mod, sum} files.
-#
-# ref: https://github.com/golang/go/issues/30515
+# Install the runsim binary
 statik: $(STATIK)
 $(STATIK):
 	@echo "Installing statik..."
-	@(cd /tmp && go get github.com/rakyll/statik@v0.1.6)
+	@go install github.com/rakyll/statik@v0.1.6
 
-# Install the runsim binary with a temporary workaround of entering an outside
-# directory as the "go get" command ignores the -mod option and will polute the
-# go.{mod, sum} files.
-#
-# ref: https://github.com/golang/go/issues/30515
+# Install the runsim binary
 runsim: $(RUNSIM)
 $(RUNSIM):
 	@echo "Installing runsim..."
-	@(cd /tmp && go get github.com/cosmos/tools/cmd/runsim@v1.0.0)
+	@go install github.com/cosmos/tools/cmd/runsim@v1.0.0
 
 tools-clean:
 	rm -f $(STATIK) $(GOLANGCI_LINT) $(RUNSIM)
 	rm -f tools-stamp
 
-.PHONY: tools-clean statik runsim
+.PHONY: tools-clean statik runsim