Prefer GitHub Actions.

[ioquatix]

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[trans]

Thanks for putting this together — there's a lot of good modernization work here. We're in the process of reviving Facets and agree with most of these changes:

• Moving to GitHub Actions
• Removing Ruby 1.8 compat code
• Removing Enumerable#filter (conflicts with Ruby built-in)
• Removing taint references
• URI.escape → CGI.escape
• Cleaning up require 'facets/enumerator'

However, given Facets' nature as a cherry-pickable library, we need to apply these piecemeal rather than as one large changeset. In particular, the Hash (rekey, deep_rekey, revalue) and OpenStruct deletions need individual evaluation against modern Ruby before removing. There are also a couple of debug lines (pp "LOADING NUDGE", binding.irb) that slipped in.

We'll be incorporating these improvements incrementally. Closing this PR but the work is very much appreciated and will be used.