Disable schema tests for now

Old client versions are blocked, and our handling of old schema versions
is going to change

Author: dstillman

tests/remote/tests/API/3/SchemaTest.php

@@ -34,6 +34,10 @@ class SchemaTests extends APITests {
 		"Some data in “My Library” was created in a newer version of Zotero and could not be downloaded. "
 			. "Upgrade Zotero to continue syncing this library.";
 
+	public function setUp(): void {
+		$this->markTestSkipped();
+	}
+	
 	public function tearDown(): void {
 		API::resetSchemaVersion(false);
 	}