Increased release version to 5.84.0

[esteffin]

• 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

Patch coverage has no change and project coverage change: +0.33 🎉

Comparison is base (fc35bed) 78.21% compared to head (3c1e1f3) 78.54%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7731      +/-   ##
===========================================
+ Coverage    78.21%   78.54%   +0.33%     
===========================================
  Files         1688     1688              
  Lines       193001   193001              
===========================================
+ Hits        150959   151599     +640     
+ Misses       42042    41402     -640     

see 40 files with indirect coverage changes

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