[DNM] Testing Maven proxy

[wzieba]

Context: https://github.com/Automattic/buildkite-ci/pull/871

[dangermattic]

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Android by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Android
	Build Type	Debug
	Version	pr23031-12587e3
	Build Number	1497
	Application ID	com.jetpack.android.prealpha
	Commit	12587e3
	Installation URL	37v3gngq9m3j8

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Android by scanning the QR code below to install the corresponding build.

	App Name	WordPress Android
	Build Type	Debug
	Version	pr23031-12587e3
	Build Number	1497
	Application ID	org.wordpress.android.prealpha
	Commit	12587e3
	Installation URL	2uu1q6hcig8mg

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