Fix some deprecations

[dmitryuk]

• Method "Doctrine\DBAL\Driver::connect()" might add "DriverConnection" as a native return type declaration in the future. Do the same in implementation "DH\Auditor\Provider\Doctrine\Auditing\Logger\Middleware\DHDriver" now to avoid errors or add an explicit @return annotation to suppress this message
• The "Symfony\Component\Console\Command\Command::$defaultName" property is considered final. You should not override it in "DH\Auditor\Provider\Doctrine\Persistence\Command\CleanAuditLogsCommand"

[codecov[bot]]

Codecov Report

Merging #125 (b2d405d) into master (610de8f) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #125   +/-   ##
=======================================
  Coverage   92.67%   92.67%           
=======================================
  Files          43       43           
  Lines        1516     1516           
=======================================
  Hits         1405     1405           
  Misses        111      111           

Impacted Files	Coverage Δ
...r/Doctrine/Auditing/Logger/Middleware/DHDriver.php	100.00% <100.00%> (ø)
...rine/Persistence/Command/CleanAuditLogsCommand.php	93.47% <100.00%> (ø)
...ctrine/Persistence/Command/UpdateSchemaCommand.php	100.00% <100.00%> (ø)

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