Update doctrine/dbal requirement from ^2.9 to ^3.1

[dependabot-preview[bot]]

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

Release notes

Sourced from doctrine/dbal's releases.

3.1.0

Release 3.1.0

3.1.0

• Total issues resolved: 3
• Total pull requests resolved: 16
• Total contributors: 5

Deprecation,New Feature

• 4607: Introduce Statement::executeQuery and Statement::executeStatement. thanks to @beberlei

Deprecation,Documentation

• 4589: Reference methods using parentheses thanks to @PowerKiKi

Deprecation,Documentation,Reserved Keywords

• [4587: [GH-4510] Deprecate ReservedWordsCommand::setKeywordListClass()](doctrine/dbal#4587) thanks to @morozov

Deprecation,Oracle,Schema Managers

• [4584: [GH-4503] Mark OracleSchemaManager methods internal](doctrine/dbal#4584) thanks to @morozov

Error Handling,Improvement,Prepared Statements,oci8

• 4581: Fix truncated oracle fetch result thanks to @amenning

Deprecation,Improvement,QueryBuilder

• 4578: Predictable QueryBuilder::executeQuery() and QueryBuilder::executeStatement() thanks to @PowerKiKi

Deprecation

• 4568: Trigger runtime deprecations for previously deprecated APIs thanks to @morozov

Connections,Sequences,pdo_sqlsrv

... (truncated)

Commits

• 5ba62e7 Merge branch '3.0.x' into 3.1.x
• 4dd066d Merge pull request #4610 from doctrine/2.13.x-merge-up-into-3.0.x_607db0f4870...
• c800380 Merge pull request #4608 from morozov/shepherd
• 05b7797 Attribute type coverage metric to 3.1.x instead of 2.13.x
• 9fc431a Merge pull request #4604 from morozov/shepherd
• 275131f Merge branch '3.0.x' into 3.1.x
• 41d7dd9 Merge branch '2.13.x' into 3.0.x
• a25bc6a Replace 2.12 with 2.13 in README
• ef629cf Collect type coverage metrics, add badge to README
• f4a801b Merge pull request #4596 from mdumoulin/fix_issue_4591
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)