Do release for CBMC version 5.68.0

[TGWDB]

• 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.
• 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).
• 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

Base: 77.99% // Head: 77.99% // No change to project coverage 👍

Coverage data is based on head (afea391) compared to base (9baef8f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7237   +/-   ##
========================================
  Coverage    77.99%   77.99%           
========================================
  Files         1619     1619           
  Lines       187184   187184           
========================================
  Hits        145999   145999           
  Misses       41185    41185           

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