Integrated: build: update to Gradle 7.0

[Erik Helin]

On Mon, 12 Apr 2021 13:34:49 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that updates Gradle to version `7.0`. Gradle is a bit stricter in 7.0 when it comes to consuming task output, so I had to ensure that the `Output` properties per task were unique.
> 
> Thanks,
> Erik

This pull request has now been integrated.

Changeset: 0a79bfc7
Author:    Erik Helin <ehelin at openjdk.org>
URL:       https://git.openjdk.java.net/skara/commit/0a79bfc7
Stats:     35 lines in 5 files changed: 5 ins; 18 del; 12 mod

build: update to Gradle 7.0

Reviewed-by: erikj

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PR: https://git.openjdk.java.net/skara/pull/1113