Update symfony/var-dumper requirement from ^4.0 to ^5.1

[dependabot-preview]

Updates the requirements on symfony/var-dumper to permit the latest version.

Release notes

Sourced from symfony/var-dumper's releases.

v5.1.0

Changelog (symfony/var-dumper@v5.1.0-RC2...v5.1.0)

• no changes

Changelog

Sourced from symfony/var-dumper's changelog.

5.1.0

• added RdKafka support

4.4.0

• added VarDumperTestTrait::setUpVarDumper() and VarDumperTestTrait::tearDownVarDumper() to configure casters & flags to use in tests
• added ImagineCaster and infrastructure to dump images
• added the stamps of a message after it is dispatched in TraceableMessageBus and MessengerDataCollector collected data
• added UuidCaster
• made all casters final
• added support for the NO_COLOR env var (https://no-color.org/)

4.3.0

• added DsCaster to support dumping the contents of data structures from the Ds extension

4.2.0

• support selecting the format to use by setting the environment variable VAR_DUMPER_FORMAT to html or cli

4.1.0

• added a ServerDumper to send serialized Data clones to a server
• added a ServerDumpCommand and DumpServer to run a server collecting and displaying dumps on a single place with multiple formats support
• added CliDescriptor and HtmlDescriptor descriptors for server:dump CLI and HTML formats support

4.0.0

• support for passing \ReflectionClass instances to the Caster::castObject() method has been dropped, pass class names as strings instead
• the Data::getRawData() method has been removed
• the VarDumperTestTrait::assertDumpEquals() method expects a 3rd $filter = 0 argument and moves $message = '' argument at 4th position.
• the VarDumperTestTrait::assertDumpMatchesFormat() method expects a 3rd $filter = 0 argument and moves $message = '' argument at 4th position.

3.4.0

• added AbstractCloner::setMinDepth() function to ensure minimum tree depth
• deprecated MongoCaster

... (truncated)

Commits

• 46a9429 Merge branch '5.0' into 5.1
• 2c787a1 Merge branch '4.4' into 5.0
• 56b3aa5 Merge branch '3.4' into 4.4
• 0ef96ca Merge branch '4.4' into 5.0
• 9ecbc89 Parse and render anonymous classes correctly on php 8
• 399d6c1 Merge branch '5.0' into 5.1
• 25095a0 Merge branch '4.4' into 5.0
• 66d64f3 Merge branch '3.4' into 4.4
• 7a947d1 [VarDumper] fix PHP 8 support
• 77d81a0 Merge branch '3.4' into 4.4
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #59.