Update version number for release 5.65.0

[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

Merging #7092 (381b34d) into develop (f4d92f2) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #7092   +/-   ##
========================================
  Coverage    77.85%   77.85%           
========================================
  Files         1574     1574           
  Lines       181245   181245           
========================================
  Hits        141109   141109           
  Misses       40136    40136           

Impacted Files	Coverage Δ
src/goto-instrument/contracts/contracts.h	100.00% <ø> (ø)
src/ansi-c/c_expr.h	100.00% <100.00%> (ø)
src/ansi-c/c_typecheck_code.cpp	77.15% <100.00%> (ø)
src/goto-instrument/contracts/contracts.cpp	94.31% <100.00%> (ø)

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