refactor: replace boost::container::deque with std::deque

[isotauon]

Summary

• Use std::deque in src/codec/codec_test.cc and src/codec/codec_bench_test.cc — boost::container::deque adds nothing over the standard one here.
• Drop the boost/container/deque.hpp include from src/codec/row_codec.{h,cc} and src/tablet/tablet_impl.cc, where it was already unused. No behavior change.

Test plan

• codec_test and codec_bench_test build and pass in CI.
• tablet_impl still builds.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.31%. Comparing base (1d5edd3) to head (50236d2).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4113   +/-   ##
=========================================
  Coverage     75.31%   75.31%           
  Complexity      711      711           
=========================================
  Files           763      763           
  Lines        143738   143738           
  Branches       1537     1480   -57     
=========================================
+ Hits         108252   108254    +2     
+ Misses        35183    35181    -2     
  Partials        303      303           

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