[JetBrains] Update Gradle to the same version used in other components (v7.3.1) #14435
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Description
In other components from Gitpod we're using Gradle v7.3.1. So we'll also use in

jetbrains-test
.This fixes this warning [Reported Internally] from VS Code:

How to test
Open this branch in gitpod.io using VS Code and confirm if there's no warning about Gradle.
Release Notes
Werft options:
If enabled this will build
install/preview
Valid options are
all
,workspace
,webapp
,ide