Upgrade to Gradle wrapper version 9.1.0

[devbridie]

This PR updates the Gradle wrapper version to 9.1.0, which adds support for JDK 25.

This fixes the following error which you will see when building with JDK 25:

Configuration on demand is an incubating feature.

FAILURE: Build failed with an exception.

* What went wrong:
25

* Try:
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

* Exception is:
java.lang.IllegalArgumentException: 25
        at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.parse(JavaVersion.java:307)
        at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.current(JavaVersion.java:176)
        at org.jetbrains.kotlin.cli.jvm.modules.JavaVersionUtilsKt.isAtLeastJava9(javaVersionUtils.kt:11)
        at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$2(CoreJrtFileSystem.kt:83)
        at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$3(CoreJrtFileSystem.kt:74)
        at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap$2.create(ConcurrentFactoryMap.java:174)
        at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap.get(ConcurrentFactoryMap.java:40)

[riggaroo]

I was doing the same change in the update deps PR :D but lets merge this separately.