Integrated: build: update to Gradle 6.6

[Erik Helin]

On Tue, 18 Aug 2020 12:53:21 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that updates Gradle to version 6.6.
> 
> Testing:
> - [x] `make test` passes on Linux x64
> - [x] `make images` passes on Linux x64
> 
> Thanks,
> Erik

This pull request has now been integrated.

Changeset: 3b088e9f
Author:    Erik Helin <ehelin at openjdk.org>
URL:       https://git.openjdk.java.net/skara/commit/3b088e9f
Stats:     4 lines in 2 files changed: 0 ins; 0 del; 4 mod

build: update to Gradle 6.6

Reviewed-by: rwestberg

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PR: https://git.openjdk.java.net/skara/pull/722