Update immutables to v2.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.immutables:value-processor (source)	2.12.0 → 2.12.1
org.immutables:value-annotations (source)	2.12.0 → 2.12.1
org.immutables:builder (source)	2.12.0 → 2.12.1

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Release Notes

immutables/immutables (org.immutables:value-processor)

v2.12.1

Compare Source

Maintenance & bugfix release

• #​1631 new PlainAttribute as a workaround
• #​1632 fixed incompatibility of builders for package-private records and visibility=PUBLIC
• #​1630 fixed Staged builder's new start() incompatible with pojos etc.

What's Changed

• JDK 23+ (Upgraded build and matrix to include Java 25/javac) by @​SimY4 in #​1627

Full Changelog: immutables/immutables@2.12.0...2.12.1

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