[CPAN-Meta-Requirements] fix string comparisons with $] to use numeric comparison instead

The fix follows Zefram's suggestion from
https://www.nntp.perl.org/group/perl.perl5.porters/2012/05/msg186846.html

> On older perls, however, $] had a numeric value that was built up using
> floating-point arithmetic, such as 5+0.006+0.000002.  This would not
> necessarily match the conversion of the complete value from string form
> [perl #72210].  You can work around that by explicitly stringifying
> $] (which produces a correct string) and having *that* numify (to a
> correctly-converted floating point value) for comparison.  I cultivate
> the habit of always stringifying $] to work around this, regardless of
> the threshold where the bug was fixed.  So I'd write
>
>     use if "$]" >= 5.014, warnings => "non_unicode";

Author: book

cpan/CPAN-Meta-Requirements/t/from-hash.t

@@ -43,7 +43,7 @@ for my $string (10, '>= 2, <= 9, != 7') {
 
 SKIP: {
   skip "Can't tell v-strings from strings until 5.8.1", 1
-    unless $] gt '5.008';
+    unless "$]" > 5.008;
   my $string_hash = {
     Left   => 10,
     Shared => '= 2',
@@ -87,7 +87,7 @@ SKIP: {
 
 SKIP: {
   skip "Can't tell v-strings from strings until 5.8.1", 2
-    unless $] gt '5.008';
+    unless "$]" > 5.008;
   my $string_hash = {
     Left   => 10,
     Shared => v50.44.60,