Mysterious package conflicts for postgresql15-15.8-1.fc40.x86_64 (Fedora 40)

Today, when I ran a "dnf update", I got these messages:

Problem 1: package postgresql15-15.8-1.fc40.x86_64 from updates conflicts with postgresql provided by postgresql10-10.23-1PGDG.f37.x86_64 from @System
- cannot install the best update candidate for package postgresql15-15.8-1PGDG.f40.x86_64
- problem with installed package postgresql10-10.23-1PGDG.f37.x86_64
Problem 2: package postgresql15-server-15.8-1.fc40.x86_64 from updates conflicts with postgresql-server provided by postgresql10-server-10.23-1PGDG.f37.x86_64 from @System
- cannot install the best update candidate for package postgresql15-server-15.8-1PGDG.f40.x86_64
- problem with installed package postgresql10-server-10.23-1PGDG.f37.x86_64
Problem 3: package postgresql15-contrib-15.8-1.fc40.x86_64 from updates conflicts with postgresql-contrib provided by postgresql11-contrib-11.22-2PGDG.f39.x86_64 from @System
- cannot install the best update candidate for package postgresql15-contrib-15.8-1PGDG.f40.x86_64
- problem with installed package postgresql11-contrib-11.22-2PGDG.f39.x86_64
Problem 4: package postgresql15-docs-15.8-1.fc40.x86_64 from updates requires postgresql15(x86-64) = 15.8-1.fc40, but none of the providers can be installed
- package postgresql15-15.8-1.fc40.x86_64 from updates conflicts with postgresql provided by postgresql11-11.22-2PGDG.f39.x86_64 from @System
- cannot install the best update candidate for package postgresql15-docs-15.8-1PGDG.f40.x86_64
- problem with installed package postgresql11-11.22-2PGDG.f39.x86_64
=============================================================================================================================================================================
Package Architecture Version Repository Size
=============================================================================================================================================================================
Skipping packages with conflicts:
(add '--best --allowerasing' to command line to force their upgrade):
postgresql15 x86_64 15.8-1.fc40 updates 1.7 M
postgresql15-contrib x86_64 15.8-1.fc40 updates 976 k
postgresql15-server x86_64 15.8-1.fc40 updates 6.3 M
Skipping packages with broken dependencies:
postgresql15-docs x86_64 15.8-1.fc40 updates 2.2 M

I can uninstall the old PostgreSQL versions, but I would like to keep them, since
I sometimes have to investigate problems with old versions.

Is that conflict deliberate? I admit that I don't quite understand where it comes from.

Yours,
Laurenz Albe