Connection: work around a WP user caching bug (#40188)

WP bug #62003 leads to inconsistent format of cached user data in certain circumstances.
It happens if only one field gets fetched from the database, so we add ID to work around the issue.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/11859369283

Upstream-Ref: Automattic/jetpack@cd03f86

composer.json

@@ -6,7 +6,7 @@
 	"require": {
 		"php": ">=7.2",
 		"automattic/jetpack-assets": "^3.0.0",
-		"automattic/jetpack-connection": "^6.0.0",
+		"automattic/jetpack-connection": "^6.0.1-alpha",
 		"automattic/jetpack-constants": "^3.0.0",
 		"automattic/jetpack-plans": "^0.5.0",
 		"automattic/jetpack-redirect": "^3.0.0",