Fix clang-tidy issues - const correctness - misc-const-correctness

[eljonny]

There are locations in the code where a local or other-scoped object can and should be declared const.

/mnt/c/Users/user/Code/TestCPP/src/TestCPPAssertions.cpp:51:13: error: variable 'eptr' of type 'exception_ptr' can be declared 'const' [misc-const-correctness,-warnings-as-errors]
   51 |             exception_ptr eptr = current_exception();
      |             ^
      |                           const