ruby 3.0 support

[eguzki]

• Ruby 3.0.X
• Bundler 2.3.5
• Dropping support for Ruby 2.6 and 2.7 (EOL reached or about to reach)
• Docker image based on registry.access.redhat.com/ubi9/ruby-30

[codecov-commenter]

Codecov Report

Base: 98.56% // Head: 96.56% // Decreases project coverage by -1.99% ⚠️

Coverage data is based on head (139eb66) compared to base (c01175c).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 139eb66 differs from pull request most recent head fca936a. Consider uploading reports for the commit fca936a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
- Coverage   98.56%   96.56%   -2.00%     
==========================================
  Files         349      302      -47     
  Lines       17126    15497    -1629     
==========================================
- Hits        16880    14965    -1915     
- Misses        246      532     +286     

Impacted Files	Coverage Δ
...unit/commands/proxy_command/update_command_spec.rb	100.00% <100.00%> (ø)
spec/unit/entities/account_spec.rb	100.00% <100.00%> (ø)
spec/unit/remote_cache_spec.rb	100.00% <100.00%> (ø)
spec/shared_examples.rb	1.44% <0.00%> (-98.56%)	⬇️
spec/shared_contexts.rb	32.35% <0.00%> (-67.65%)	⬇️
spec/helpers.rb	30.00% <0.00%> (-63.00%)	⬇️
spec/custom_matchers.rb	53.84% <0.00%> (-46.16%)	⬇️
...cale_toolbox/commands/remote_command/remote_add.rb	70.37% <0.00%> (-29.63%)	⬇️
...ce_command/copy_command/bump_proxy_version_task.rb	72.72% <0.00%> (-27.28%)	⬇️
...e_toolbox/commands/plans_command/import_command.rb	73.17% <0.00%> (-26.83%)	⬇️
... and 71 more

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