Mark cbmc version 5.55.0

[NlightNFotis]

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• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
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[codecov]

Codecov Report

Merging #6802 (16adb91) into develop (69ac490) will increase coverage by 0.00%.
The diff coverage is 75.00%.

@@           Coverage Diff            @@
##           develop    #6802   +/-   ##
========================================
  Coverage    76.97%   76.97%           
========================================
  Files         1593     1593           
  Lines       184104   184140   +36     
========================================
+ Hits        141718   141747   +29     
- Misses       42386    42393    +7     

Impacted Files	Coverage Δ
src/util/std_expr.h	93.18% <50.00%> (-0.48%)	⬇️
src/util/validate_expressions.cpp	93.75% <90.00%> (-1.71%)	⬇️
src/util/std_expr.cpp	69.67% <100.00%> (+1.56%)	⬆️
src/util/bitvector_expr.h	97.34% <0.00%> (+0.05%)	⬆️

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