Update third-party miniz to 0c30a001bc3c70

[tautschnig]

This version 3.0.2 of miniz plus all the changes up to and incluing the fix for CVE-2018-12913.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.43%. Comparing base (07cf0bb) to head (35bf91a).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8563      +/-   ##
===========================================
+ Coverage    78.95%   79.43%   +0.47%     
===========================================
  Files         1730     1730              
  Lines       198759   197598    -1161     
  Branches     18314    17932     -382     
===========================================
+ Hits        156938   156958      +20     
+ Misses       41821    40640    -1181     

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[TGWDB]

I'm taking the first commit is the noted miniz code on faith (I've not manually checked it).