dra: rename ubi8 for ubi9

[v1v]

Motivation/summary

APM Server in 7.17 uses the packaging system from elastic/beats but elastic/beats has not been updated to use ubi9 yet.

This is the workaround until the upstream project moves to ubi9

Checklist

• Update CHANGELOG.asciidoc
• Update package changelog.yml (only if changes to apmpackage have been made)
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Create some files and run the script locally

$ mkdir -p build/distributions
$ touch "build/distributions/apm-server-7.17.15-aarch64.rpm"
touch "build/distributions/apm-server-ubi8-7.17.15-linux-amd64.docker.tar.gz"
touch "build/distributions/apm-server-oss-7.17.15-linux-arm64.docker.tar.gz"
touch "build/distributions/apm-server-oss-7.17.15-SNAPSHOT-linux-arm64.docker.tar.gz"
touch "build/distributions/apm-server-7.17.15-linux-arm64.docker.tar.gz"
touch "build/distributions/apm-server-7.17.15-SNAPSHOT-linux-arm64.docker.tar.gz"
touch "build/distributions/apm-server-oss-7.17.15-SNAPSHOT-linux-amd64.docker.tar.gz"
touch "build/distributions/apm-server-oss-7.17.15-linux-amd64.docker.tar.gz"
touch "build/distributions/apm-server-7.17.15-linux-amd64.docker.tar.gz"
touch "build/distributions/apm-server-7.17.15-SNAPSHOT-linux-amd64.docker.tar.gz"
touch "build/distributions/apm-server-ubi8-7.17.15-linux-arm64.docker.tar.gz"
touch "build/distributions/apm-server-ubi8-7.17.15-SNAPSHOT-linux-amd64.docker.tar.gz"
touch "build/distributions/apm-server-ubi8-7.17.15-SNAPSHOT-linux-arm64.docker.tar.gz"

for file in apm-server-ubi8* ; do  mv $file ${file//ubi8/ubi9} ; done

I triggered this build manually

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