mod_auth_openidc_state cookies accumulate on client until its receives 413 responses from httpd

Issue

• We have a load balancer in front of multiple httpd servers using mod_auth_openidc. In this case, mod_auth_openidc_state cookies are accumulating on the client across requests until their cookie header becomes so big, httpd begins giving them 413 responses. This is not seen if just running with one httpd server up.