update submodule LibAPR to latest (v2.1.0)

joeljonsson · joeljonsson · commit a9febd89608f · 2022-06-17T00:51:55.000+02:00
diff --git a/external/LibAPR b/external/LibAPR
@@ -1 +1 @@
-Subproject commit c8695961f93e7ccb9891b0edef7d1e09ac5778f8
+Subproject commit e8b221afd128dc422dadd4bc6144cdcb26e46531
