www/nginx: Update to 1.20.1

PR:		256172
Reported by:	Christos Chatzaras <chris@cretaforce.gr>
Reviewed by:	garga
Approved by:	maintainer timeout
MFH:		2021Q2
Security:	0882f019-bd60-11eb-9bdd-8c164567ca3c
Sponsored by:	Rubicon Communications, LLC ("Netgate")