Wait. I'm not sure any more since the source says one thing and the running module seems to say something else:

$ perl -MXML::RSS -e 'print $XML::RSS::VERSION,"\n";'
1.59

$ grep -E '1.59|1.62'  /usr/local/share/perl/5.34.0/XML/RSS.pm
$XML::RSS::VERSION = '1.62';
$VERSION = '1.59';
version 1.62
[download]

I've deleted the existing module, reinstalled it (again) via CPAN, and double checked that there is only one instance:

$ find /usr -type f -name 'RSS.pm' -print 2>/dev/null
/usr/share/perl5/XML/Feed/Entry/Format/RSS.pm
/usr/share/perl5/XML/Feed/Format/RSS.pm
/usr/local/share/perl/5.34.0/XML/RSS.pm

$ perl -e 'print join("\n",sort @INC),"\n";' 
/etc/perl
/usr/lib/x86_64-linux-gnu/perl-base
/usr/lib/x86_64-linux-gnu/perl/5.34
/usr/lib/x86_64-linux-gnu/perl5/5.34
/usr/local/lib/site_perl
/usr/local/lib/x86_64-linux-gnu/perl/5.34.0
/usr/local/share/perl/5.34.0
/usr/share/perl/5.34
/usr/share/perl5
[download]

Looking at the code, I'm fairly confident that you have v1.62, and that the claim of v1.59 is a release-process bug. I've reported this as a perl-XML-RSS issue.

It appears to be XML::RSS version 1.62:

$ head -n2 /usr/share/perl5/XML/RSS.pm
package XML::RSS;
$XML::RSS::VERSION = '1.62';
[download]

That supports RSS 2.0 and that, if I read the spec correctly, allows additional namespaces, such as Dublin Core.