sources: Removal of ALIENVAULT and SPAMHAUS_EDROP from ipblocklist sources

sources: Removal of ALIENVAULT and SPAMHAUS_EDROP from ipblocklist sources

- ALIENVAULT has not been updated since at least Nov 2022 but probably earlier. There is no
   date for the file to be downloaded but a forum user has log messages from Nov 2022 that
   indicate the file had not changed as therefore no download occurred.
- AT&T aquired AlienVault in August 2018. Somewhere between 2018 and 2022 the list stopped
   getting updated. AlienVault references on the AT&T website are now for a different
   product.
- Discussed in IPFire conf call of April 2024 and agreed to remove the ALIENVAULT
   blocklist.
- On Apr 10th the Spamhaus eDROP list was merged with the Spamhaus DROP list. The eDROP
   list is still available but is now empty. Trying to select the SPAMHAUS_EDROP list
   gives an error message that the blocklist was found to be empty.
- This patch removes both the ALIENVAULT and the SPAMHAUS_EDROP lists from the ipblocklist
   sources file.

Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>