Update go.sum before building proxygen (#106)

* Update go.sum before building proxygen

The unpinned versions (e.g. we depend on the latest version of
google.golang.org/genproto) change frequently and if the go.sum isn't
updated, builds will fail.

* Bump the go version used by ci workflow

Proxy codegen needs 1.18 or higher.

.github/workflows/ci.yml

@@ -14,6 +14,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: "1.17"
+          go-version: "1.18"
       - name: Check
         run: make check test

Makefile

@@ -63,7 +63,7 @@ grpc-mock:
 .PHONY: proxy
 proxy:
 	printf $(COLOR) "Generate proxy code..."
-	(cd ./cmd/proxygenerator && go run ./)
+	(cd ./cmd/proxygenerator && go mod tidy && go run ./)
 
 goimports:
 	printf $(COLOR) "Run goimports..."
@@ -112,7 +112,7 @@ test:
 
 generatorcheck:
 	printf $(COLOR) "Check generated code is not stale..."
-	(cd ./cmd/proxygenerator && go run ./ -verifyOnly)
+	(cd ./cmd/proxygenerator && go mod tidy && go run ./ -verifyOnly)
 
 check: generatorcheck