[9.0] (backport #18263) Downgrade gradle to coninute testing on windows server 2016

[mergify]

Release notes

[rn:skip]

What does this PR do?

When gradle was upgraded in #17947 the windows 2016 acceptance tests started to fail due to gradle dropping support for that platform. #18209 (comment)

We want to keep the forward compatability changes in #17947 and downgrade to the last version of gradle that supports windows 2016 (probably 8.11.1 according to gradle/gradle#31939 (comment)).

---

This is an automatic backport of pull request #18263 done by Mergify.

[mergify]

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	both modified:   gradle/wrapper/gradle-wrapper.jar
	both modified:   gradle/wrapper/gradle-wrapper.properties
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[elasticmachine]

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History

cc @donoghuc

[donoghuc]

Leave at 8.7