fix(wear-leveling): Reset cached keys

[munanwugo-opentrons]

This PR adds one line to the write flow of the EEPROM to reset the cached key after a write has been launched. This fixes a potential issue where a read, a write, and another write performed by the user will result in the second write using stale data.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.02%. Comparing base (a34d526) to head (1b30417).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #852   +/-   ##
=======================================
  Coverage   76.02%   76.02%           
=======================================
  Files         167      167           
  Lines       15626    15627    +1     
  Branches      992      992           
=======================================
+ Hits        11879    11880    +1     
  Misses       3585     3585           
  Partials      162      162           

see 1 file with indirect coverage changes

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