Mark CBMC version 5.56.0

[NlightNFotis]

• 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).
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[codecov]

Codecov Report

Merging #6837 (2e306c6) into develop (e5f91f2) will not change coverage.
The diff coverage is 87.50%.

@@           Coverage Diff            @@
##           develop    #6837   +/-   ##
========================================
  Coverage    77.04%   77.04%           
========================================
  Files         1594     1594           
  Lines       185276   185276           
========================================
  Hits        142748   142748           
  Misses       42528    42528           

Impacted Files	Coverage Δ
src/solvers/flattening/bv_pointers.h	100.00% <ø> (ø)
src/solvers/flattening/pointer_logic.h	72.72% <50.00%> (ø)
src/solvers/flattening/pointer_logic.cpp	91.35% <85.71%> (ø)
src/goto-programs/goto_trace.cpp	81.51% <100.00%> (ø)
src/solvers/flattening/bv_pointers.cpp	85.16% <100.00%> (ø)
src/solvers/smt2/smt2_conv.cpp	67.48% <100.00%> (ø)
... and 1 more

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