Updated to the newest version and now I cannot connect to the web admin interface

Yes, as clearly indicated in the prominent header in that file:

###############################################################################
#     FILE AUTOMATICALLY OVERWRITTEN BY PI-HOLE INSTALL/UPDATE PROCEDURE.     #
# ANY CHANGES MADE TO THIS FILE AFTER INSTALL WILL BE LOST ON THE NEXT UPDATE #
#                                                                             #
#              CHANGES SHOULD BE MADE IN A SEPARATE CONFIG FILE:              #
#                         /etc/lighttpd/external.conf                         #
###############################################################################

Changes to the lighttpd port should be made in the external.conf file, which is not subject to be overwritten by a Pi-hole repair or update.

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