My Pihole upgrade failed at the FTL stage
I am new to linux and using a pi II have been running pihole for a while saw the upgrade notification and had a go using "pihole -u"
I have followed the instructions but FTL still does not update. Please help
Expected Behaviour:
pihole updates 
Actual Behaviour:
pihole -v
Pi-hole version is v5.2.4 (Latest: v5.5)
AdminLTE version is v5.4 (Latest: v5.7)
FTL version is v5.7 (Latest: v5.10.2)
sudo pihole -up
[i] Checking for updates...
[i] Pi-hole Core: update available
[i] Web Interface: update available
[i] FTL: update available
[i] Pi-hole core files out of date, updating local repo.
[✓] Check for existing repository in /etc/.pihole
[i] Update repo in /etc/.pihole...HEAD is now at dad6247 Merge pull request #4347 from pi-hole/development
[✓] Update repo in /etc/.pihole
[i] If you had made any changes in '/etc/.pihole/', they have been stashed using 'git stash'
[i] Pi-hole Web Admin files out of date, updating local repo.
[✓] Check for existing repository in /var/www/html/admin
[i] Update repo in /var/www/html/admin...HEAD is now at 50f43bd Merge pull request #1901 from pi-hole/devel
[✓] Update repo in /var/www/html/admin
[i] If you had made any changes in '/var/www/html/admin/', they have been stashed using 'git stash'
[i] FTL out of date, it will be updated by the installer.
[✓] Root user check
.;;,.
.ccccc:,.
:cccclll:. ..,,
:ccccclll. ;ooodc
'ccll:;ll .oooodc
.;cll.;;looo:.
.. ','.
.',,,,,,'.
.',,,,,,,,,,.
.',,,,,,,,,,,,....
....''',,,,,,,'.......
......... .... .........
.......... ..........
.......... ..........
......... .... .........
........,,,,,,,'......
....',,,,,,,,,,,,.
.',,,,,,,,,'.
.',,,,,,'.
..'''.
[✗] Update local cache of available packages
Error: Unable to update package cache. Please try "sudo apt-get update"
Unable to complete update, please contact Pi-hole Support
sudo apt-get update
Hit:1 Index of /debian buster InRelease
Get:2 Index of /raspbian buster InRelease [15.0 kB]
Hit:3 Index of /repos/code/ stable InRelease
Reading package lists... Done
E: Repository 'Index of /raspbian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.