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_64from @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_64from @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_64from @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
noneof 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_64from @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