Fixed PhpStan issues in box/spout bridge

[yann-eugone]

No description provided.

[codecov]

Codecov Report

Merging #57 (ed13db1) into 0.x (a8cf8a9) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                 0.x       #57   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       712       713    +1     
===========================================
  Files            121       121           
  Lines           1805      1815   +10     
===========================================
+ Hits            1805      1815   +10     

Impacted Files	Coverage Δ
src/batch-box-spout/src/Reader/FlatFileReader.php	100.00% <ø> (ø)
...batch-box-spout/src/Reader/Options/SheetFilter.php	100.00% <ø> (ø)
...c/batch/src/Job/Item/Exception/SkipItemOnError.php	100.00% <0.00%> (ø)
...atch-symfony-console/src/RunCommandJobLauncher.php	100.00% <0.00%> (ø)
...tch-doctrine-dbal/src/DoctrineDBALUpsertWriter.php	100.00% <0.00%> (ø)
...tch-symfony-validator/src/SkipItemOnViolations.php	100.00% <0.00%> (ø)
...trine-dbal/src/DoctrineDBALJobExecutionStorage.php	100.00% <0.00%> (ø)

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