all: bump Go to v1.20.4

> go1.20.4 (released 2023-05-02) includes three security fixes to the
> html/template package, as well as bug fixes to the compiler, the
> runtime, and the crypto/subtle, crypto/tls, net/http, and syscall
> packages. See the Go 1.20.4 milestone on our issue tracker for
> details.

Go 1.20.4 milestone:
https://github.com/golang/go/issues?q=milestone%3AGo1.20.4+label%3ACherryPickApproved

Signed-off-by: Robin Hahling <robin.hahling@gw-computing.net>

.github/workflows/tests.yml

@@ -22,7 +22,7 @@ jobs:
     - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
     - uses: actions/setup-go@4d34df0c2316fe8122ab82dc22947d607c0c91f9
       with:
-        go-version: '1.20.3'
+        go-version: '1.20.4'
     - name: Run static checks
       uses: golangci/golangci-lint-action@08e2f20817b15149a52b5b3ebe7de50aff2ba8c5
       with:

Makefile

@@ -25,7 +25,7 @@ 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 --rm --workdir /hubble --volume `pwd`:/hubble docker.io/library/golang:1.20.3-alpine3.17@sha256:08e9c086194875334d606765bd60aa064abd3c215abfbcf5737619110d48d114 \
+	docker run --rm --workdir /hubble --volume `pwd`:/hubble docker.io/library/golang:1.20.4-alpine3.17@sha256:913de96707b0460bcfdfe422796bb6e559fc300f6c53286777805a9a3010a5ea \
 		sh -c "apk add --no-cache setpriv make git && \
 			/usr/bin/setpriv --reuid=$(RELEASE_UID) --regid=$(RELEASE_GID) --clear-groups make GOCACHE=/tmp/gocache local-release"