Robin Dvořák

Update to symfony 5

1

| Q | A | ------------- | --- |Description, reason for the PR| ... |New feature| Yes/No |[BC breaks](https://docs.shopsys.com/en/latest/contributing/backward-compatibility-promise/)| Yes/No |Fixes issues| ... |Have you read and signed our [License...

[shopsys] update install script

1

| Q | A | ------------- | --- |Description, reason for the PR| ... |New feature| Yes/No |[BC breaks](https://docs.shopsys.com/en/latest/contributing/backward-compatibility-promise/)| Yes/No |Fixes issues| ... |Have you read and signed our [License...