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). Version removal only.
• Update other dependencies if applicable (eg: jmx_exporter, etc). Version removal only.
• Initialize new product versions with patchable and add patches if applicable. Version removal only.
• 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. removed version not mentioned.

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.

• chore: Remove ZooKeeper 3.9.3 #1401
• chore: Remove ZooKeeper 3.9.3 zookeeper-operator#1001
• test: Remove ZooKeeper 3.9.3 druid-operator#784
• test: Remove ZooKeeper 3.9.3 hbase-operator#728
• test: Remove ZooKeeper 3.9.3 hdfs-operator#744
• test: Remove ZooKeeper 3.9.3 nifi-operator#887
• test: Remove ZooKeeper 3.9.3 trino-operator#836
• No usage of 3.9.3 in demos

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