Update jms/serializer requirement from ^3.7 to ^3.8

[dependabot-preview]

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

Release notes

Sourced from jms/serializer's releases.

3.8.0

Implemented enhancements:

• Use doctrine/lexer instead of hoa/compiler #1212 (goetas)

Fixed bugs:

• Consider exclude rules on parents if defined #1206 (goetas)
• hoa/protocol package conflicts with laravel helper #1154

Merged pull requests:

• Remove conflicts to hoa packages #1216 (alexander-schranz)
• Test also agains twig 3 #1215 (alexander-schranz)
• Allow doctrine/persistence v2/v3 #1210 (goetas)

Changelog

Sourced from jms/serializer's changelog.

3.8.0 (2020-06-28)

Implemented enhancements:

• Use doctrine/lexer instead of hoa/compiler #1212 (goetas)

Fixed bugs:

• Consider exclude rules on parents if defined #1206 (goetas)
• hoa/protocol package conflicts with laravel helper #1154

Merged pull requests:

• Remove conflicts to hoa packages #1216 (alexander-schranz)
• Test also agains twig 3 #1215 (alexander-schranz)
• Allow doctrine/persistence v2/v3 #1210 (goetas)

3.7.0 (2020-05-23)

Implemented enhancements:

• Allow deserialization of typehinted DateTimeInterface to DateTime class #1193 (goetas)
• Infer types from PHP 7.4 type declarations #1192 (goetas)
• Support conditional exclude for classes #1099 (arneee)

Fixed bugs:

• Exclude if at class level are not merge #1203
• Class level expression exclusion strategy should work with hierarchies #1204 (goetas)

Closed issues:

• Specify Type as nullable? #1191
• Does someone know how to use phpdoc with serializer? #1185
• Serializer doesn't keep types but convert them if not it can #1181
• ConditionalExpose/Exclude annotation does not work on class level #1098

Merged pull requests:

• Fix deprecated assertFileNotExist #1197 (mpoiriert)
• [Docs] Improve documentation on dynamic exclusion strategy #1188 (arneee)
• Fix Support conditional exclude for classes #1187 (arneee)
• Fix travis tests #1183 (peter279k)
• Replace "Exclude" by "Expose" #1180 (kpn13)
• add .gitattributes #1177 (Tobion)

3.6.0 (2020-03-21)

Implemented enhancements:

Commits

• 13ead2c prepare 3.8.0
• 77a97c8 Merge pull request #1215 from alexander-schranz/patch-2
• 8ae2f37 Merge pull request #1216 from alexander-schranz/patch-3
• ee1f417 Remove conflicts to hoa packages
• e7894ab Test also agains twig 3
• c3e1977 Merge pull request #1212 from schmittjoh/remove-hoa-compiler
• 8ca11fb Use doctrine lexer instead of HOA
• c538b10 Require doctrine/lexer
• 5b682e9 Merge pull request #1210 from schmittjoh/doctrine-persistence-2
• fa56ece run ci against latest doctrine persistence 2.0
• Additional commits viewable in compare view

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