update base images for integration and e2e to go-toolset:1.21

this updates the update-go-version.sh script to also updaate go
versions in the files images/*/Containerfile

fixes #4185

images/build-e2e/Containerfile

@@ -1,5 +1,5 @@
 
-FROM registry.access.redhat.com/ubi8/go-toolset:1.20 AS builder
+FROM registry.access.redhat.com/ubi8/go-toolset:1.21 AS builder
 
 USER root
 

images/build-integration/Containerfile

@@ -1,5 +1,5 @@
 
-FROM registry.access.redhat.com/ubi8/go-toolset:1.20 AS builder
+FROM registry.access.redhat.com/ubi8/go-toolset:1.21 AS builder
 
 USER root
 

update-go-version.sh

@@ -14,6 +14,7 @@ go mod edit -go ${golang_base_version} tools/go.mod
 sed -i "s,^GOVERSION = 1.[0-9]\+,GOVERSION = ${golang_base_version}," Makefile
 sed -i "s,^\(FROM registry.ci.openshift.org/openshift/release:rhel-8-release-golang-\)1.[0-9]\+,\1${golang_base_version}," images/*/Dockerfile
 sed -i "s,^FROM registry.access.redhat.com/ubi8/go-toolset:[.0-9]\+,FROM registry.access.redhat.com/ubi8/go-toolset:${golang_base_version}," images/*/Dockerfile
+sed -i "s,^FROM registry.access.redhat.com/ubi8/go-toolset:[.0-9]\+,FROM registry.access.redhat.com/ubi8/go-toolset:${golang_base_version}," images/*/Containerfile
 for f in .github/workflows/*.yml; do
     if [ $(yq  eval '.jobs.build.strategy.matrix | has("go")' "$f") == "true" ]; then
       yq eval --inplace ".jobs.build.strategy.matrix.go[0] = ${golang_base_version} | .jobs.build.strategy.matrix.go[0] style=\"single\"" "$f";