Perl 5.34 support

[hurricup]

<< Perl 5.32 | Perl 5.36 >>

Reference: https://perldoc.perl.org/perl5340delta.html

• [x] check that we handle native try/catch syntax (#2532)
• [ ] check empty lower bound qr/{,n}/
• [ ] check that spaces rupport in substitutions: \x{ FFFC }, \b{}, \g{}, \k{}, \N{}, \o{} regexp , { m , n }. despite /x presence. Also test \p{} and \P{}
• [ ] new octal syntax support: 0oddddd, e.g. 0o123_456 (https://metacpan.org/pod/release/XSAWYERX/perl-5.34.0-RC1/pod/perldata.pod#Scalar-value-constructors and https://metacpan.org/pod/release/XSAWYERX/perl-5.34.0-RC1/pod/perlfunc.pod#oct-EXPR)