pdksync - Remove Puppet 5 from testing and bump minimal version to 6.0.0

[carabasdaniel]

Remove Puppet 5 from testing and bump minimal version to 6.0.0
pdk version: 1.19.0.pre (47)

[codecov-io]

Codecov Report

Merging #972 (7e62749) into main (8c1bd7b) will decrease coverage by 0.14%.
The diff coverage is 72.41%.

@@            Coverage Diff             @@
##             main     #972      +/-   ##
==========================================
- Coverage   81.22%   81.07%   -0.15%     
==========================================
  Files          11       11              
  Lines        1678     1670       -8     
==========================================
- Hits         1363     1354       -9     
- Misses        315      316       +1     

Impacted Files	Coverage Δ
lib/facter/ip6tables_version.rb	85.71% <ø> (ø)
lib/facter/iptables_persistent_version.rb	21.42% <ø> (ø)
lib/facter/iptables_version.rb	85.71% <ø> (ø)
lib/puppet/provider/firewall.rb	37.50% <ø> (ø)
lib/puppet/type/firewall.rb	79.59% <35.00%> (-0.34%)	⬇️
...ib/puppet/provider/firewallchain/iptables_chain.rb	36.14% <50.00%> (+0.43%)	⬆️
lib/puppet/provider/firewall/ip6tables.rb	90.12% <100.00%> (ø)
lib/puppet/provider/firewall/iptables.rb	90.18% <100.00%> (+0.05%)	⬆️
lib/puppet/type/firewallchain.rb	89.79% <100.00%> (-0.21%)	⬇️
lib/puppet/util/firewall.rb	92.06% <100.00%> (-0.13%)	⬇️
... and 5 more

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