Fix unique_ptr type

[RobertWilbrandt]

gcc 12 warns about this:

In file included from /usr/include/c++/12/memory:76,
                 from /home/wilbrandt/FZI/robot_folders/checkout/ur_humble/colcon_ws/src/Universal_Robots_Client_Library/include/ur_client_library/log.h:21,
                 from /home/wilbrandt/FZI/robot_folders/checkout/ur_humble/colcon_ws/src/Universal_Robots_Client_Library/src/log.cpp:31:
In member function ‘void std::default_delete<_Tp>::operator()(_Tp*) const [with _Tp = char]’,
    inlined from ‘void std::__uniq_ptr_impl<_Tp, _Dp>::reset(pointer) [with _Tp = char; _Dp = std::default_delete<char>]’ at /usr/include/c++/12/bits/unique_ptr.h:203:16,
    inlined from ‘void std::unique_ptr<_Tp, _Dp>::reset(pointer) [with _Tp = char; _Dp = std::default_delete<char>]’ at /usr/include/c++/12/bits/unique_ptr.h:501:12,
    inlined from ‘void urcl::log(const char*, int, LogLevel, const char*, ...)’ at /home/wilbrandt/FZI/robot_folders/checkout/ur_humble/colcon_ws/src/Universal_Robots_Client_Library/src/log.cpp:124:19:
/usr/include/c++/12/bits/unique_ptr.h:95:9: warning: ‘void operator delete(void*, std::size_t)’ called on pointer returned from a mismatched allocation function [-Wmismatched-new-delete]
   95 |         delete __ptr;
      |         ^~~~~~~~~~~~
/home/wilbrandt/FZI/robot_folders/checkout/ur_humble/colcon_ws/src/Universal_Robots_Client_Library/src/log.cpp: In function ‘void urcl::log(const char*, int, LogLevel, const char*, ...)’:
/home/wilbrandt/FZI/robot_folders/checkout/ur_humble/colcon_ws/src/Universal_Robots_Client_Library/src/log.cpp:112:38: note: returned from ‘void* operator new [](std::size_t)’
  112 |     buffer.reset(new char[buffer_size]);
      |

[codecov]

Codecov Report

Base: 51.23% // Head: 51.19% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (409bca1) compared to base (cd6f4a7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   51.23%   51.19%   -0.04%     
==========================================
  Files          82       82              
  Lines        2467     2465       -2     
  Branches      279      278       -1     
==========================================
- Hits         1264     1262       -2     
- Misses       1072     1073       +1     
+ Partials      131      130       -1     

Impacted Files	Coverage Δ
src/log.cpp	55.81% <100.00%> (ø)
include/ur_client_library/queue/atomicops.h	50.00% <0.00%> (-3.34%)	⬇️
tests/test_tcp_server.cpp	99.23% <0.00%> (+0.75%)	⬆️
include/ur_client_library/comm/producer.h	40.00% <0.00%> (+1.90%)	⬆️

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[fmauch]

Seems reasonable, tested and it works.