Remove workarounds for XMPP bots

[ghost]

XMPP based bots were removed in 3.0.0

[codecov-commenter]

Codecov Report

Merging #2048 (d8c90b6) into develop (ff7d835) will decrease coverage by 0.31%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2048      +/-   ##
===========================================
- Coverage    75.98%   75.66%   -0.32%     
===========================================
  Files          428      428              
  Lines        23002    22696     -306     
  Branches      3062     3058       -4     
===========================================
- Hits         17477    17173     -304     
+ Misses        4817     4814       -3     
- Partials       708      709       +1     

Impacted Files	Coverage Δ
intelmq/lib/bot.py	62.32% <ø> (+0.26%)	⬆️
intelmq/bots/experts/cymru_whois/_lib.py	17.02% <0.00%> (-5.76%)	⬇️
intelmq/bots/experts/abusix/_lib.py	36.84% <0.00%> (-3.16%)	⬇️
intelmq/bots/experts/modify/expert.py	92.00% <0.00%> (-2.67%)	⬇️
intelmq/tests/bots/collectors/rt/test_collector.py	75.00% <0.00%> (-2.50%)	⬇️
intelmq/tests/bots/experts/wait/test_expert.py	48.00% <0.00%> (-2.00%)	⬇️
intelmq/tests/bots/experts/uwhoisd/test_expert.py	60.00% <0.00%> (-1.91%)	⬇️
intelmq/bots/parsers/eset/parser.py	74.35% <0.00%> (-1.84%)	⬇️
intelmq/tests/bots/experts/lookyloo/test_expert.py	60.86% <0.00%> (-1.64%)	⬇️
intelmq/tests/bots/experts/abusix/test_expert.py	56.66% <0.00%> (-1.40%)	⬇️
... and 237 more

[ghost]

Some similar workaround is maybe needed for the n6stomp collector and output, but we'd need to validate that first.