Update codebase to PHP 7.4

[yann-eugone]

No description provided.

[codecov]

Codecov Report

Merging #12 (4c3d6db) into 0.x (e19c57f) will decrease coverage by 0.01%.
The diff coverage is 87.50%.

@@             Coverage Diff              @@
##                0.x      #12      +/-   ##
============================================
- Coverage     82.32%   82.31%   -0.02%     
+ Complexity      479      478       -1     
============================================
  Files            62       62              
  Lines          1386     1385       -1     
============================================
- Hits           1141     1140       -1     
  Misses          245      245              

Impacted Files	Coverage Δ	Complexity Δ
src/batch-box-spout/src/FlatFileReader.php	94.44% <ø> (ø)	17.00 <0.00> (ø)
src/batch-box-spout/src/FlatFileWriter.php	94.28% <ø> (ø)	15.00 <0.00> (ø)
...ch-doctrine-dbal/src/JobExecutionRowNormalizer.php	60.20% <ø> (ø)	21.00 <0.00> (ø)
src/batch-doctrine-orm/src/EntityReader.php	100.00% <ø> (ø)	4.00 <0.00> (ø)
...rc/batch-doctrine-persistence/src/ObjectWriter.php	100.00% <ø> (ø)	11.00 <0.00> (ø)
src/batch-symfony-console/src/CommandRunner.php	86.36% <ø> (ø)	8.00 <0.00> (ø)
...atch-symfony-console/src/RunCommandJobLauncher.php	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/batch-symfony-console/src/RunJobCommand.php	87.30% <ø> (ø)	19.00 <0.00> (ø)
...mfony-messenger/src/DispatchMessageJobLauncher.php	100.00% <ø> (ø)	2.00 <0.00> (ø)
...c/batch-symfony-messenger/src/LaunchJobMessage.php	100.00% <ø> (ø)	3.00 <0.00> (ø)
... and 31 more

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