chore(zookeeper): Update major/minor versions for 26.3.0

[NickLarsenNZ]

Part of #1368.

• Remove: 3.9.3

Update tasks

• Update boil-config.toml to reflect the agreed upon versions in the spreadsheet (including the removal of old versions).
• Update boil-config.toml to the latest supported version of JVM (base and devel).
• Update other dependencies if applicable (eg: jmx_exporter, etc).
• Initialize new product versions with patchable and add patches if applicable.
• Delete old patch directories.
• Check the corresponding operator (getting_started / kuttl / supported-versions) for usage of the versions.
• Check other operators (getting_started / kuttl / supported-versions) for usage of the versions. Add the PR(s) to the list below.
• Update the version in demos. Add the PR(s) to the list below.

Related Pull Requests

Tip

Delete any items that do not apply so that all applicable items can be checked.
For example, if you add release notes to the documentation repository, you do not need the latter two criteria.

• Link to the docker-images PR (product update)
• Link to the operator PR (getting_started / kuttl / supported-versions)
• Link to any other operator PRs (getting_started / kuttl)
• Link to demo PR (raise against the main branch)
• Link to the Release Notes PR in the documentation repo (if not a comment below)

Please consider updating this template if these instructions are wrong, or
could be made clearer.