po4a requires missing Syntax::Keyword::Try Perl module
Since v0.67, PO4A depends on Syntax::Keyword::Try, which is not listed as a dependency and not yet packaged for Alpine.
See https://github.com/mquinson/po4a/blob/2766a7625e5f515c0dbd729c69cc074c8f02d86d/lib/Locale/Po4a/Text.pm#L61 for the dependency.