[oracle-database] Update release information

[etil2jz]

On October 14th, Oracle decided to replace 23ai with the new 26ai release, vanishing mentions of 23ai in their documentation.

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[usta]

@etil2jz why do you want to remove 23 cycle ? And we are NOT allowing to add future ( not released ) versions as PR

[marcwrobel]

Given what's said on https://mikedietrichde.com/2025/10/14/oracle-ai-database-26ai-replaces-oracle-database-23ai/, we can either:

1. replace also 23ai with 26ai as suggested, add a note in the description to explain what happened, and set up a redirect, as suggested in this PR,
2. or add a new 26ai release cycle, deprecating the 23ai, and add a note in the description to explain what happened.

I would prefer the 2nd solution : it is not a breaking change, and it makes more obvious what happened.

@etil2jz are you willing to perform those changes in this PR ?

[usta]

Looks like they changed release date info to 2025 on https://docs.oracle.com/en/database/oracle/oracle-database/26/nfcoa/
So what do you prefer to do @marcwrobel ?

[captn3m0]

It appears that the release cycle for the the new 26ai release is still kept as 23 - it is indeed in the same upgrade cycle and not a new major release. It is just the branding that is changing.

From the blog post linked above:

The first number of the release stays the same since Oracle AI Database 26ai simply replaces Oracle Database 23ai – it remains “23”.

The second number of the release indicates the year of the release update, e.g. 26 for 2026.

I found this official PR on the Oracle container image repo which also treats it as a 23.x -> 23.26 release upgrade.

My suggestion is to change the releaseLabel for the 23 cycle to 26ai now, and add a note that clarifies that the 23ai release cycle is now called 26ai but the version numbers are 23.26.x and that it is a backward-compatible upgrade.