Update 10up/elasticpress requirement from ~4.5.2 to ~4.6.0

Updates the requirements on [10up/elasticpress](https://github.com/10up/ElasticPress) to permit the latest version.
- [Release notes](https://github.com/10up/ElasticPress/releases)
- [Changelog](https://github.com/10up/ElasticPress/blob/develop/CHANGELOG.md)
- [Commits](10up/ElasticPress@4.5.2...4.6.0)

---
updated-dependencies:
- dependency-name: 10up/elasticpress
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -11,7 +11,7 @@
 	],
 	"require": {
 		"php": ">=7.1",
-		"10up/elasticpress": "~4.5.2",
+		"10up/elasticpress": "~4.6.0",
 		"humanmade/debug-bar-elasticpress": "~1.6.3"
 	},
 	"autoload" : {