Upstream changes:
0.085 2022-04-16 T. R. Wyant
Remove 'postderef' argument to PPIx::Regexp->new(). Postfix
dereference is always recognized.
0.084 2022-04-02 T. R. Wyant
Require PPI 1.238 for postfix deref support, and recode the
postfix deref logic in terms of 1.238's functionality.
Parse '@{[ ... ]}' as code, not interpolation. This is more in line
with what it actually represents, and allows correct versioning of
postfix dereferences. But is is an incompatible change.
24b37e9652