phan: Update custom stubs (#46628)

* phan: Update custom stubs.
* PHPUnit tests: Remove deprecated `$this->any()` calls.
  Fortunately `->expects()` before `->method()` isn't required anymore
  even in the oldest PHPUnit version we have to support.

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Co-authored-by: matticbot <[email protected]>
Co-authored-by: Brad Jorsch <[email protected]>

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/21080038562

Upstream-Ref: Automattic/jetpack@ee80bb2

Author: anomiex

composer.json

@@ -6,7 +6,7 @@
 	"require": {
 		"php": ">=7.2",
 		"automattic/jetpack-admin-ui": "^0.5.11",
-		"automattic/jetpack-connection": "^6.20.2",
+		"automattic/jetpack-connection": "^6.20.3-alpha",
 		"automattic/jetpack-autoloader": "^5.0.15",
 		"automattic/jetpack-config": "^3.1.1",
 		"automattic/jetpack-assets": "^4.3.19",