Update doctrine/dbal requirement from ^2.6|^3.0 to ^3.1.1

[dependabot[bot]]

Updates the requirements on doctrine/dbal to permit the latest version.

Release notes

Sourced from doctrine/dbal's releases.

3.1.1

Release 3.1.1

3.1.1

• Total issues resolved: 1
• Total pull requests resolved: 8
• Total contributors: 5

Bug,Indexes,Platforms

• 4672: Fixed generated SQL for UniqueConstraint objects thanks to @​hschletz

Bug

• 4667: Make Table::removeUniqueConstraint() actually work thanks to @​hschletz

Improvement,Test Suite,Tools

• 4656: Allow Symfony 6 thanks to @​jderusse

Documentation

• 4642: Update versions for default branch thanks to @​SenseException
• 4635: Address class rename in the docs thanks to @​greg0ire
• 4615: Remove docs about user-provided PDO instance thanks to @​greg0ire

CI,Cache,Deprecation,Static Analysis

• 4630: Suppress deprecation notices for ArrayCache thanks to @​morozov

Character Encoding,Connections,MySQL,Test Suite

• [4614: [GH-4613] Use utf8mb4 instead of utf8 for testing connection charset](doctrine/dbal#4614) thanks to @​morozov

Commits

• See full diff in compare view

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[dependabot[bot]]

Superseded by #37.