Upgrade otel/build-protobuf image 0.2.1->0.11.0 (#46)

* Upgrade otel/build-protobuf image 0.2.1->0.11.0

Upgrades `github.com/grpc-ecosystem/grpc-gateway` v1.16.0 -> v2.10.0

Upgrades `google.golang.org/protobuf` v1.27.1 -> v1.28.0

Switch from `github.com/golang/protobuf` to `google.golang.org/protobuf`
entirely.

* Set desired grpc-gateway version

* Update go.mod creation

* Go back to supporting build on Go 1.14

* Add upgrade of unconstrained packages

* Replace instead of require

* Remove trailing back slash

* Revert back to the required method

Makefile

@@ -42,6 +42,9 @@ SOURCE_PROTO_FILES := $(subst $(OTEL_PROTO_SUBMODULE),$(PROTO_SOURCE_DIR),$(SUBM
 GO_MOD_ROOT		   := go.opentelemetry.io/proto
 OTLP_OUTPUT_DIR    := otlp
 GO_VERSION         := 1.14
+# TODO: Remove this when support for Go <1.17 is dropped. Versions > v2.7.0 of
+# github.com/grpc-ecosystem/grpc-gateway/v2 require Go 1.17.
+OTLP_REQUIRE       := github.com/grpc-ecosystem/grpc-gateway/v2@v2.7.0
 
 # Function to execute a command. Note the empty line before endef to make sure each command
 # gets executed separately instead of concatenated with previous one.
@@ -51,7 +54,7 @@ $(1)
 
 endef
 
-OTEL_DOCKER_PROTOBUF ?= otel/build-protobuf:0.2.1
+OTEL_DOCKER_PROTOBUF ?= otel/build-protobuf:0.11.0
 PROTOC := docker run --rm -u ${shell id -u} -v${PWD}:${PWD} -w${PWD} ${OTEL_DOCKER_PROTOBUF} --proto_path="$(PROTO_SOURCE_DIR)"
 
 .DEFAULT_GOAL := protobuf
@@ -90,8 +93,10 @@ copy-otlp-protobuf:
 	rm -rf ./$(OTLP_OUTPUT_DIR)
 	mkdir -p ./$(OTLP_OUTPUT_DIR)
 	@rsync -a $(PROTOBUF_TEMP_DIR)/go.opentelemetry.io/proto/otlp/ ./$(OTLP_OUTPUT_DIR)
-	cd ./$(OTLP_OUTPUT_DIR) && go mod init $(GO_MOD_ROOT)/$(OTLP_OUTPUT_DIR)
-	@cd ./$(OTLP_OUTPUT_DIR) && go mod edit -go=$(GO_VERSION) && go get ./...
+	cd ./$(OTLP_OUTPUT_DIR) \
+		&& go mod init $(GO_MOD_ROOT)/$(OTLP_OUTPUT_DIR) \
+		&& go mod edit -go=$(GO_VERSION) -require=$(OTLP_REQUIRE) \
+		&& go mod tidy
 
 .PHONY: clean
 clean:

go.mod

@@ -1,3 +1,3 @@
 module go.opentelemetry.io/proto
 
-go 1.15
+go 1.15