Update Go to 1.15.6

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

.github/workflows/unittests.yml

@@ -17,7 +17,7 @@ jobs:
         path: go/src/github.com/cilium/hubble
     - uses: actions/setup-go@v1
       with:
-        go-version: '1.15.5'
+        go-version: '1.15.6'
     - name: Run static checks
       env:
         GOPATH: /home/runner/work/hubble/go
@@ -38,7 +38,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v1
         with:
-          go-version: '1.15.5'
+          go-version: '1.15.6'
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Check module vendoring

Dockerfile

@@ -1,4 +1,4 @@
-FROM docker.io/library/golang:1.15.5-alpine3.12 as builder
+FROM docker.io/library/golang:1.15.6-alpine3.12 as builder
 WORKDIR /go/src/github.com/cilium/hubble
 RUN apk add --no-cache git make
 COPY . .

Makefile

@@ -20,7 +20,7 @@ hubble:
 	$(GO) build $(if $(GO_TAGS),-tags $(GO_TAGS)) -ldflags "-w -s -X 'github.com/cilium/hubble/pkg.GitBranch=${GIT_BRANCH}' -X 'github.com/cilium/hubble/pkg.GitHash=$(GIT_HASH)' -X 'github.com/cilium/hubble/pkg.Version=${VERSION}'" -o $(TARGET)
 
 release:
-	docker run --env "RELEASE_UID=$(RELEASE_UID)" --env "RELEASE_GID=$(RELEASE_GID)" --rm --workdir /hubble --volume `pwd`:/hubble docker.io/library/golang:1.15.5-alpine3.12 \
+	docker run --env "RELEASE_UID=$(RELEASE_UID)" --env "RELEASE_GID=$(RELEASE_GID)" --rm --workdir /hubble --volume `pwd`:/hubble docker.io/library/golang:1.15.6-alpine3.12 \
 		sh -c "apk add --no-cache make && make local-release"
 
 local-release: clean