fix: Null replication values are now handled when incrementing bookmarks

[edgarrmondragon]

Related:

• Closes bug: increment state is breaking when new_value is null #1714

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📚 Documentation preview 📚: https://meltano-sdk--2438.org.readthedocs.build/en/2438/

[codspeed-hq]

CodSpeed Performance Report

Merging #2438 will not alter performance

_{Comparing 1714-bug-increment-state-is-breaking-when-new_value-is-null-1 (1fd9a49) with main (e0c5dfd)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.19%. Comparing base (0132f0b) to head (1fd9a49).
Report is 140 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2438   +/-   ##
=======================================
  Coverage   89.18%   89.19%           
=======================================
  Files          54       54           
  Lines        4789     4792    +3     
  Branches      936      937    +1     
=======================================
+ Hits         4271     4274    +3     
  Misses        361      361           
  Partials      157      157           

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