Make 0.11 branch compatible with Sylius 1.9

[Roshyo]

Fixes #160

Merge this OR #172 but not both of them.

[codecov]

Codecov Report

Merging #173 (80b283f) into 0.11.x (072f481) will increase coverage by 0.07%.
The diff coverage is 0.00%.

❗ Current head 80b283f differs from pull request most recent head b61de55. Consider uploading reports for the commit b61de55 to get more accurate results

@@             Coverage Diff             @@
##             0.11.x    #173      +/-   ##
===========================================
+ Coverage      9.51%   9.59%   +0.07%     
  Complexity      360     360              
===========================================
  Files            63      63              
  Lines          1166    1157       -9     
===========================================
  Hits            111     111              
+ Misses         1055    1046       -9     

Impacted Files	Coverage Δ
src/Controller/Action/AddGiftCardToOrderAction.php	0.00% <0.00%> (ø)
src/Controller/Action/GiftCardBalanceAction.php	0.00% <0.00%> (ø)
src/Controller/Action/SearchGiftCardAction.php	0.00% <0.00%> (ø)
...endencyInjection/SetonoSyliusGiftCardExtension.php	70.00% <ø> (ø)
...istener/DefaultGiftCardConfigurationSubscriber.php	0.00% <ø> (ø)
src/Model/GiftCard.php	6.89% <ø> (ø)
src/Model/GiftCardConfiguration.php	0.00% <ø> (ø)
.../Provider/GiftCardChannelConfigurationProvider.php	0.00% <ø> (ø)

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[loevgaard]

I think this PR can be closed?