Allow symfony/options-resolver to use version ^5.1

[phansys]

Subject

Allow symfony/options-resolver to use version ^5.1, since this major version doesn't have breaking changes. See:

• https://github.com/symfony/options-resolver/blob/v5.0.0/CHANGELOG.md#500.

I am targeting this branch, because this change respects BC.

Depends on sonata-project/SonataAdminBundle#6299, sonata-project/SonataDoctrineORMAdminBundle#1091, sonata-project/SonataBlockBundle#730.
.

Changelog

### Added
- Added support for symfony/options-resolver:^5.1.

[codecov-commenter]

Codecov Report

Merging #1210 into 4.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                4.x    #1210   +/-   ##
=========================================
  Coverage     69.51%   69.51%           
  Complexity      455      455           
=========================================
  Files            46       46           
  Lines          1404     1404           
=========================================
  Hits            976      976           
  Misses          428      428           

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[greg0ire]

Thanks @phansys !