upgrade to Gradle 8.14

[gavinking]

amazingly, this appears to make my IntelliJ problems disappear!

[Please describe here what your change is about]

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[gavinking]

Hrm, this breaks the tests for the Hibernate Gradle plugin.

[gavinking]

Hrm, this breaks the tests for the Hibernate Gradle plugin.

Does this mean our plugin is incompatible with Gradle 8.14, or something more benign?

[gavinking]

The problem appears to be something to do with this:

sourceSets {
    mySpecialSourceSet {
        java {
            srcDirs "src/mySpecialSourceSet/java"
        }
    }
}

hibernate {
    useSameVersion = false
    sourceSet = 'mySpecialSourceSet'

This works in Gradle 8.8, but apparently it's broken in 8.9 and above.

@sebersole It appears that this functionality has been deprecated for removal since HHH-16307. Can we just disable the test?

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