Error: Failed to download metadata for repo 'pgdg16': repomd.xml GPG signature verification error: Signing key not found

All;

Recently I have been seeing repo errors whin I try to run a dnf update
on my Fedora 39 laptop.

Below is the full output from an update attempt today

Note: running dnf clean all before the update does not fix the issue

Thanks in advance for any help

 root(at)XPS17 # dnf update
Brave Browser                                         17 kB/s | 17
kB     00:01
Fedora 39 - x86_64                                   4.5 MB/s | 89
MB     00:19
Fedora 39 openh264 (From Cisco) - x86_64             1.7 kB/s | 2.5
kB     00:01
Fedora 39 - x86_64 - Updates                         3.8 MB/s | 27
MB     00:07
Darktable (Fedora_39)                                 35 kB/s | 76
kB     00:02
PostgreSQL common RPMs for Fedora 39 - x86_64        758  B/s | 659 
B     00:00
PostgreSQL common RPMs for Fedora 39 - x86_64        1.6 MB/s | 1.7
kB     00:00
PostgreSQL common RPMs for Fedora 39 - x86_64        831  B/s | 659 
B     00:00
Error: Failed to download metadata for repo 'pgdg-common': repomd.xml
GPG signature verification error: Signing key not found
PostgreSQL 16 for Fedora 39 - x86_64                 521  B/s | 659 
B     00:01
PostgreSQL 16 for Fedora 39 - x86_64                 1.6 MB/s | 1.7
kB     00:00
PostgreSQL 16 for Fedora 39 - x86_64                 475  B/s | 659 
B     00:01
Error: Failed to download metadata for repo 'pgdg16': repomd.xml GPG
signature verification error: Signing key not found
PostgreSQL 15 for Fedora 39 - x86_64                 797  B/s | 659 
B     00:00
PostgreSQL 15 for Fedora 39 - x86_64                 1.6 MB/s | 1.7
kB     00:00
PostgreSQL 15 for Fedora 39 - x86_64                 704  B/s | 659 
B     00:00
Error: Failed to download metadata for repo 'pgdg15': repomd.xml GPG
signature verification error: Signing key not found
PostgreSQL 14 for Fedora 39 - x86_64                 777  B/s | 659 
B     00:00
PostgreSQL 14 for Fedora 39 - x86_64                 1.6 MB/s | 1.7
kB     00:00
PostgreSQL 14 for Fedora 39 - x86_64                 729  B/s | 659 
B     00:00
Error: Failed to download metadata for repo 'pgdg14': repomd.xml GPG
signature verification error: Signing key not found
PostgreSQL 13 for Fedora 39 - x86_64                 490  B/s | 659 
B     00:01
PostgreSQL 13 for Fedora 39 - x86_64                 1.6 MB/s | 1.7
kB     00:00
PostgreSQL 13 for Fedora 39 - x86_64                 511  B/s | 659 
B     00:01
Error: Failed to download metadata for repo 'pgdg13': repomd.xml GPG
signature verification error: Signing key not found
PostgreSQL 12 for Fedora 39 - x86_64                 493  B/s | 659 
B     00:01
PostgreSQL 12 for Fedora 39 - x86_64                 1.6 MB/s | 1.7
kB     00:00
PostgreSQL 12 for Fedora 39 - x86_64                 506  B/s | 659 
B     00:01
Error: Failed to download metadata for repo 'pgdg12': repomd.xml GPG
signature verification error: Signing key not found
PostgreSQL 11 for Fedora 39 - x86_64 99  B/s | 146  B     00:01
Errors during downloading metadata for repository 'pgdg11':
  - Status code: 404 for
https://download.postgresql.org/pub/repos/yum/11/fedora/fedora-39-x86_64/repodata/repomd.xml
(IP: 87.238.57.227)
Error: Failed to download metadata for repo 'pgdg11': Cannot download
repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
RPM Fusion for Fedora 39 - Free 253 kB/s | 639 kB     00:02
RPM Fusion for Fedora 39 - Free - Updates 120 kB/s | 138 kB     00:01
RPM Fusion for Fedora 39 - Nonfree 127 kB/s | 259 kB     00:02
RPM Fusion for Fedora 39 - Nonfree - Updates 50 kB/s |  72 kB     00:01
Ignoring repositories: pgdg-common, pgdg16, pgdg15, pgdg14, pgdg13,
pgdg12, pgdg11