Bump @guardian/libs to 21.6.0 (#13534)

Author: akinsola-guardian

dotcom-rendering/package.json

@@ -47,7 +47,7 @@
 		"@guardian/eslint-config-typescript": "9.0.1",
 		"@guardian/identity-auth": "6.0.1",
 		"@guardian/identity-auth-frontend": "8.1.0",
-		"@guardian/libs": "21.4.0",
+		"@guardian/libs": "21.6.0",
 		"@guardian/ophan-tracker-js": "2.2.5",
 		"@guardian/react-crossword": "2.0.2",
 		"@guardian/react-crossword-next": "npm:@guardian/[email protected]",