ERB: Add support for modern Ruby

[bastelfreak]

Without this, we get:

/code/target/staging/.bundle/gems/ruby/3.2.0/gems/packaging-0.122.3/lib/packaging/util/file.rb:67: warning: Passing safe_level with the 2nd argument of ERB.new is deprecated. Do not use it, and specify other arguments as keyword arguments.
2716
/code/target/staging/.bundle/gems/ruby/3.2.0/gems/packaging-0.122.3/lib/packaging/util/file.rb:67: warning: Passing trim_mode with the 3rd argument of ERB.new is deprecated. Use keyword argument like ERB.new(str, trim_mode: ...) instead.

[ekohl]

I recall this was introduced in Ruby 2.6 or 2.7 so you'll need to update the lower bound as well:

packaging/packaging.gemspec

Line 16 in 85780d0

gem.required_ruby_version = '>= 2.0.0'

[bastelfreak]

I'm still debating which lower version we need. If I understand the pipelines in openvox-server correctly, the packaging gem is already used on Ruby 3.2. Given that 3.1 and older are already dead, it probably makes sense to directly bump to 3.2?

[ekohl]

I think that's fine, but looks like CI also needs to be updated.

[bastelfreak]

Switching to 3.2 in #13