chore(deps): update mariadb:latest docker digest to 77e8ad8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mariadb	service	digest	5d851e9 -> 77e8ad8

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[codecov]

Codecov Report

Merging #197 (f2df7e2) into master (59a3bfc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #197   +/-   ##
=========================================
  Coverage     90.90%   90.90%           
  Complexity       17       17           
=========================================
  Files             1        1           
  Lines            22       22           
=========================================
  Hits             20       20           
  Misses            2        2           

Flag	Coverage Δ
unittests	90.90% <ø> (ø)

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