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 #463 (0d2dda5) into main (57187de) will decrease coverage by 7.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #463      +/-   ##
==========================================
- Coverage   82.45%   75.43%   -7.02%     
==========================================
  Files           5        5              
  Lines          57       57              
==========================================
- Hits           47       43       -4     
- Misses         10       14       +4     

Impacted Files	Coverage Δ
lib/facter/java_libjvm_path.rb	83.33% <ø> (ø)
lib/facter/java_major_version.rb	88.88% <ø> (ø)
lib/facter/java_patch_level.rb	44.44% <ø> (-44.45%)	⬇️
lib/facter/java_version.rb	73.33% <0.00%> (ø)
lib/facter/java_default_home.rb	83.33% <100.00%> (ø)

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