Use Go 1.18 (#238)

/cherry-pick

Signed-off-by: 1gtm <1gtm@appscode.com>

Author: 1gtm

.github/workflows/ci.yml

@@ -13,10 +13,10 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.17
+      - name: Set up Go 1.18
         uses: actions/setup-go@v1
         with:
-          go-version: 1.17
+          go-version: 1.18
         id: go
 
       - name: Check out code into the Go module directory

Makefile

@@ -61,9 +61,9 @@ ARCH := $(if $(GOARCH),$(GOARCH),$(shell go env GOARCH))
 BASEIMAGE_PROD   ?= gcr.io/distroless/static-debian11
 BASEIMAGE_DBG    ?= debian:bullseye
 
-GO_VERSION       ?= 1.17
+GO_VERSION       ?= 1.18
 BUILD_IMAGE      ?= appscode/golang-dev:$(GO_VERSION)
-CHART_TEST_IMAGE ?= quay.io/helmpack/chart-testing:v3.4.0
+CHART_TEST_IMAGE ?= quay.io/helmpack/chart-testing:v3.5.1
 
 OUTBIN = bin/$(OS)_$(ARCH)/$(BIN)
 ifeq ($(OS),windows)