Unable to upgrade to postgresql 13 I'm getting the following error:

postgres@:~/&gt;cat loadable_libraries.txt could not load library
&quot;$libdir/plpython2&quot;: ERROR:  could not access file
&quot;$libdir/plpython2&quot;: No such file or directory In database: db_name

When trying to run pg_upgrade from PostgreSQL-11 to PostgreSQL-13.
/usr/pgsql-13/bin/pg_upgrade -b /usr/pgsql-11/bin -B /usr/pgsql-13/bin -c -d /localpart0/db/postgres/11/db_name/data -D/localpart0/db/postgres/13/db_name/data -j 20 -r -v --clone

I don't have any plpython* extensions and already tried changing the pg_pltemplate entries for plpythonu and plpython2u to plpython3 and run the pg_upgrade but it fails either way.
Installed Packages:

postgresql11-plpython.x86_64    11.7-1PGDG.rhel7  @postgres11.prd
postgresql13-plpython3.x86_64   13.1-1PGDG.rhel7  @postgres13.prd

Any guidance would be greatly appreciated.
If someone has a better answer or suggestion please let me know. Otherwise, I believe I found the answer in the pgsql-general mailing list;
https://www.postgresql.org/message-id/936117.1605644139%40sss.pgh.pa.us
Hi,
On Tue, 2020-11-17 at 21:00 +0100, Marcin Giedz wrote:

Hi all, trying to performe upgrade from 12 to 13 installed from
Centos8 repo gives such error:
cat loadable_libraries.txt
could not load library &quot;$libdir/plpython2&quot;: ERROR: could not access
file &quot;$libdir/plpython2&quot;: No such file or directory

I dropped PL/Python support along with PostgreSQL 13 RPMs.
Regards,
Devrim Gündüz
Open Source Solution Architect, Red Hat Certified Engineer
Twitter: @DevrimGunduz , @DevrimGunduzTR