Not a KaOS or update issue, outside repos can't be the responsibility of KaOS.
Curl provides libcurl.so, see all libcurl.s in the repo:
core/curl 7.80.0-1 /usr/lib/libcurl.so
core/curl 7.80.0-1 /usr/lib/libcurl.so.4
core/curl 7.80.0-1 /usr/lib/libcurl.so.4.7.0
apps/lightworks 2021.2.1-1 /usr/lib/lightworks/libcurl.so
apps/lightworks 2021.2.1-1 /usr/lib/lightworks/libcurl.so.4
apps/lightworks 2021.2.1-1 /usr/lib/lightworks/libcurl.so.4.7.0
apps/scilab 6.1.1-1 /usr/lib/scilab/thirdparty/libcurl.so
It probably looks for a libcurl.so in a different path. Using outside repos will cause all kinds of issues, since KaOS is rolling & independant, so you will very often see wrong versions for all kinds of libraries. Please don't do it, no further support will be provided for this in the forum.