Implement Ruby 3.3 support

[bastelfreak]

Use Case

Ruby 3.3 is available since some months. Some people build puppet against system Ruby and some distros already ship Ruby 3.3 or prepare it. As a Puppet user I would like to see support for current Ruby versions in latest Puppet

Describe the Solution You Would Like

Add Ruby 3.3 to CI.

Describe Alternatives You've Considered

Additional Context

This also correlates to puppetlabs/puppet-enterprise_issues#8

[github-actions]

Migrated issue to PUP-12029

[joshcooper]

This is blocked on #9209

[ekohl]

In Fedora https://bugzilla.redhat.com/show_bug.cgi?id=2280109 was reported, where Fedora 40 uses Puppet 8 and Ruby 3.3. The encoding parameter here changed in Ruby 3.3.

Quoting the BZ author:

For my environment, the "fix" was to edit puppet/functions/regsubst.rb#regsubst_string and simply remove the encoding argument to Regexp.compile, but that's obviously incorrect; a real patch here would probably do a switch on the encoding enum and either forcibly set the string encoding, or add Regexp::NOENCODING to re_flags in the 'N' case.

That's this line:

puppet/lib/puppet/functions/regsubst.rb

Line 91 in 779595a

inner_regsubst(target, Regexp.compile(pattern, re_flags, encoding), replacement, operation)

[ekohl]

#9351 attempts to address it, but I think it was broken before so a careful review is appreciated.