Add Java 25 to build matrix

[melissalinkert]

Raised by @mabruce.

This is one approach to including Java 25 builds. Unfortunately, there is no Gradle version that can be run on both Java 8 and Java 25. See https://docs.gradle.org/current/userguide/compatibility.html. This PR as written keeps the existing Gradle wrapper, but separately downloads and installs 9.2.1 for the Java 25 build only. I feel like there must be some nicer way to do that, so other ideas welcome.

Compatibility with both Gradle 8.x.x and 9.x.x required a few adjustments to the build.gradle, but that doesn't seem to be a problem. It's probably worth double-checking build logs and artifacts though to make sure everything looks reasonable.

I'd imagine that whatever we settle on here can be applied to other repositories, so this is mostly a place to start the discussion and not necessarily something I expect to be merged as-is.

[sbesson]

The proposed changes are consistent with the roadmap for the upcoming Java support across these libraries discussed recently i.e.:

• Java 11 is the minimal runtime requirement
• Java 17 is the minimal build requirement
• Gradle 9.x can be used for compiling across all supported LTS versions

Testing the built artifacts with different local Java versions works as expected

sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % jenv local 1.8
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % ./bin/bioformats2raw test.fake test.zarr
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/glencoesoftware/bioformats2raw/Converter has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:757)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:419)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:621)
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % jenv local 11 
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % rm -r test.zarr
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % ./bin/bioformats2raw test.fake test.zarr
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % jenv local 17                           
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % rm -r test.zarr                         
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % ./bin/bioformats2raw test.fake test.zarr
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % jenv local 21                           
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % rm -r test.zarr                         
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % ./bin/bioformats2raw test.fake test.zarr
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % jenv local 25  
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % rm -r test.zarr                         
sbesson@Sebastien-GS-MacBook-Pro-2025 bioformats2raw-0.12.0-SNAPSHOT % ./bin/bioformats2raw test.fake test.zarr
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::load has been called by nu.pattern.OpenCV$LocalLoader in an unnamed module (file:/Users/sbesson/Downloads/bioformats2raw-0.12.0-SNAPSHOT/lib/opencv-4.7.0-0.jar)
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
WARNING: Restricted methods will be blocked in a future release unless native access is enabled

https://github.com/glencoesoftware/bioformats2raw?tab=readme-ov-file#requirements should also be updated to capture the new requirements.

[erindiel]

Approving based on clarity of updated requirements in README and successful conversion in local Java 17 environment.