Upgrade gVisor images to use ubuntu:jammy as the base image.

ubuntu:jammy is 22.04, which is a LTS version.

This is the third wave.

PiperOrigin-RevId: 666528422

images/benchmarks/hackbench/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM ubuntu:jammy
 
 RUN set -x \
         && apt-get update \

images/benchmarks/hey/Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /go/src/github.com/rakyll/hey
 RUN go mod download
 RUN CGO_ENABLED=0 go build -o /hey hey.go
 
-FROM ubuntu:18.04
+FROM ubuntu:jammy
 RUN set -x \
         && apt-get update \
         && apt-get install -y \

images/benchmarks/httpd/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM ubuntu:jammy
 
 RUN set -x \
         && apt-get update \

images/benchmarks/iperf/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM ubuntu:jammy
 
 RUN set -x \
         && apt-get update \

images/benchmarks/sysbench/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM ubuntu:jammy
 
 RUN set -x \
         && apt-get update \