perl5: updated to 5.30.3

perl v5.30.3

Security
  [CVE-2020-10543] Buffer overflow caused by a crafted regular expression
      A signed "size_t" integer overflow in the storage space calculations for nested regular expression
      quantifiers could cause a heap buffer overflow in Perl's regular expression compiler that overwrites memory
      allocated after the regular expression storage space with attacker supplied data.

      The target system needs a sufficient amount of memory to allocate partial expansions of the nested
      quantifiers prior to the overflow occurring.  This requirement is unlikely to be met on 64-bit systems.

  [CVE-2020-10878] Integer overflow via malformed bytecode produced by a crafted regular expression
      Integer overflows in the calculation of offsets between instructions for the regular expression engine could
      cause corruption of the intermediate language state of a compiled regular expression.  An attacker could
      abuse this behaviour to insert instructions into the compiled form of a Perl regular expression.

  [CVE-2020-12723] Buffer overflow caused by a crafted regular expression
      Recursive calls to "S_study_chunk()" by Perl's regular expression compiler to optimize the intermediate
      language representation of a regular expression could cause corruption of the intermediate language state of
      a compiled regular expression.

  Additional Note
      An application written in Perl would only be vulnerable to any of the above flaws if it evaluates regular
      expressions supplied by the attacker.  Evaluating regular expressions in this fashion is known to be
      dangerous since the regular expression engine does not protect against denial of service attacks in this
      usage scenario.

Incompatible Changes
      There are no changes intentionally incompatible with Perl 5.30.2.

Modules and Pragmata
  Updated Modules and Pragmata
      o  Module::CoreList has been upgraded from version 5.20200314 to 5.20200601_30.

(adam)