[8.11](backport #3787) ironbank: use ubi:9.3

[mergify]

This is an automatic backport of pull request #3787 done by Mergify.

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[elastic-sonarqube]

SonarQube Quality Gate

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[elasticmachine]

💚 Build Succeeded

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• Start Time: 2023-11-23T10:01:26.620+0000

• Duration: 45 min 5 sec

❕ Flaky test report

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[v1v]

IIUC, the ITs failures are not related to this PR. See #3787 (review)

[cmacknz]

Correct, force merging this one.