Upgrade Gradle to 9.1 which supports Java 25

[Eng-Fouad]

Description

Gradle 9.1 (which will be released soon) adds full support of Java 25.

cc @cescoffier

Implementation ideas

No response

[quarkus-bot]

/cc @glefloch, @quarkusio/devtools

[Eng-Fouad]

@gsmet @geoand @gastaldi Maybe this issue can be added to WG - Java 25 support