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: 1.18.1

[codecov-io]

Codecov Report

Merging #1366 (18fe4f4) into main (7acb8b5) will increase coverage by 4.99%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1366      +/-   ##
==========================================
+ Coverage   50.33%   55.32%   +4.99%     
==========================================
  Files          22       22              
  Lines        1055     1052       -3     
==========================================
+ Hits          531      582      +51     
+ Misses        524      470      -54     

Impacted Files	Coverage Δ
lib/facter/mysql_server_id.rb	37.50% <0.00%> (-50.00%)	⬇️
lib/puppet/provider/mysql_user/mysql.rb	87.41% <0.00%> (-0.18%)	⬇️
lib/puppet/provider/mysql_grant/mysql.rb	16.66% <0.00%> (+0.17%)	⬆️
...ppet/provider/mysql_login_path/mysql_login_path.rb	90.72% <0.00%> (+58.76%)	⬆️

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