Bump to nginx 1.23.3

[macbre]

Changes with nginx 1.23.3                                        13 Dec 2022

    *) Bugfix: an error might occur when reading PROXY protocol version 2
       header with large number of TLVs.

    *) Bugfix: a segmentation fault might occur in a worker process if SSI
       was used to process subrequests created by other modules.
       Thanks to Ciel Zhao.

    *) Workaround: when a hostname used in the "listen" directive resolves
       to multiple addresses, nginx now ignores duplicates within these
       addresses.

    *) Bugfix: nginx might hog CPU during unbuffered proxying if SSL
       connections to backends were used.