Update jms/serializer requirement from ^3.0 to ^3.3

[dependabot-preview]

Updates the requirements on jms/serializer to permit the latest version.

Release notes

Sourced from jms/serializer's releases.

3.3.0

Implemented enhancements:

• Implement short expose syntax for XML as it is available for YAML #1127 (goetas)

Fixed bugs:

• Avoid implicit expose of a property instead of virtual-property #1126 (goetas)

Closed issues:

• Accessing static property as non static #1122
• Travis builds on 1.x are failing #1120

Merged pull requests:

• Allow failures on php "7.4snapshot" (waiting for stable symfony 4.4) #1128 (goetas)
• Fix PHPUnit deprecations #1123 (Majkl578)
• Test 1.x on PHP 7.3 on Travis; fix builds for PHP 5.5 #1119 (sanmai)

Changelog

Sourced from jms/serializer's changelog.

3.3.0 (2019-09-20)

Implemented enhancements:

• Implement short expose syntax for XML as it is available for YAML #1127 (goetas)

Fixed bugs:

• Avoid implicit expose of a property instead of virtual-property #1126 (goetas)

Closed issues:

• Accessing static property as non static #1122
• Travis builds on 1.x are failing #1120

Merged pull requests:

• Allow failures on php "7.4snapshot" (waiting for stable symfony 4.4) #1128 (goetas)
• Fix PHPUnit deprecations #1123 (Majkl578)
• Test 1.x on PHP 7.3 on Travis; fix builds for PHP 5.5 #1119 (sanmai)

3.2.0 (2019-09-04)

Fixed bugs:

• PHP7.4: Deprecated warning - serializationContext.php on line 152 #1111

Closed issues:

• StaticPropertyMetadata first constructor argument not nullable #1116
• Add support for PSR-7 URIInterface objects #1115
• Upgraded 2.4 -> 3.4 / Symfony 4.3.3 #1112
• Empty namespace #1087
• Format constants (JSON, XML) #1079
• @​ExclusionPolicy(policy="ALL") causes PHP notice message #1073

Merged pull requests:

• Explain once and for all the use of StaticPropertyMetadata #1118 (goetas)
• PHP 7.4 compatibility #1113 (goetas)
• Fix typos in UPGRADING.md #1107 (jdreesen)
• Fix exclusion policy bug #1106 (spam312sn)
• Add Doctrine 2 immutable datetime types to field mapping. #1104 (Sonny812)

3.1.1 (2019-06-28)

Fixed bugs:

• Could not deserialize object if all properties have not type #1102

Merged pull requests:

• Revert "Move type check when deserializing into the graph navigator" #1103 (goetas)

... (truncated)

Commits

• 4c1e429 prepare 3.3
• 519263f Merge pull request #1127 from schmittjoh/short-expose-syntax-xml
• fb5b49f short expose syntax for xml
• 7ede68b Merge pull request #1128 from schmittjoh/allow-failure-on7.4-snapshot
• 9878921 allow failures on php "7.4snapshot" (waiting for stable symfony 4.4)
• 7344ef9 Merge pull request #1126 from schmittjoh/i596-implicit-expose-property
• 78092dc do not expose properties instead of virtual-properties when using YAML and
• 49dbcf2 assignment on separate line
• ff89778 Merge pull request #1123 from Majkl578/phpunit-deprecations
• 1b1b3f5 Eliminate PHPUnit's deprecated assertArraySubset()
• Additional commits viewable in compare view

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