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

[dependabot]

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

Release notes

Sourced from doctrine/dbal's releases.

Release 3.0.0

Release 3.0.0

This is a major release of Doctrine DBAL that focuses on API improvements and removal of deprecated APIs.

Major release highlights

1. Integration with PDO has been reworked. The php_pdo extension is no longer a hard dependency of the doctrine/dbal package. The PDO API is not longer the standard for DBAL APIs.
2. The wrapper-level connection and statement classes no longer implement the corresponding driver-level interfaces.
3. Instead of being available in certain states of the Statement class, the statement result is explicitly returned as a separate value.
4. A new dedicated API has been introduced for unique constraints.
5. The prepared statement portability layer has been reworked on top of the newly introduced Driver Middleware API.
6. The logic of conversion of driver-specific error codes and exceptions has been extracted into the Exception Converter API.
7. The SQL parser has been completely reworked to allow for better compatibility with the SQL syntax.
8. The following database platforms are no longer supported:
   • Drizzle,
   • MariaDB 10.0 and older,
   • Microsoft Azure,
   • PostgreSQL 9.3 and older,
   • SQL Anywhere,
   • SQL Server 2008 and older.
9. The following drivers are no longer supported:
   • pdo_ibm,
   • sasql.
10. Passing a PDO instance initialized outside of the DBAL is no longer supported.
11. The support for UUID generation on the database side has been dropped.
12. The MasterSlaveConnection class has been renamed to PrimaryReplicaConnection.
13. The executeUpdate() method has been renamed to executeStatement().
14. All driver classes and driver-level connection and statement classes are now consistently named and declared as final.
15. All PDO-based drivers have been moved under the PDO namespace.
16. The Doctrine\DBAL\DBALException and Doctrine\DBAL\Driver\DriverException have been renamed to Doctrine\DBAL\Exception and Doctrine\DBAL\Driver\Exception respectively.

• Total issues resolved: 26
• Total pull requests resolved: 99
• Total contributors: 13

PHP 8 support

• 4207: Update locked composer/package-versions-deprecated for compatibility with PHP 8.0 thanks to @morozov
• 4203: Remove --ignore-platform-reqs from PHP 8.0 builds thanks to @morozov
• 4197: The test suite fails on PHP 8 due to introduction of the match keyword thanks to @morozov
• 4171: Inconsistent naming of method arguments thanks to @morozov
• 4028: Allow php 8 thanks to @greg0ire
• 3814: Added builds against PHP nightly on Travis thanks to @morozov
• 3802: OCI8StatementTest fails on PHP 8 thanks to @morozov

API improvements

... (truncated)

Commits

• ee6d126 Merge pull request #4433 from morozov/more-specific-statement-params-type
• 41ff58d Positional statement parameters are a list
• ede9e16 Merge pull request #4431 from BenMorel/configuration
• 5d03f6e Use individual properties in Configuration
• 0f55c0d Merge branch '2.12.x' into 3.0.x
• c2c8488 Merge pull request #4403 from simPod/patch-1
• 041df42 Merge pull request #4397 from morozov/issues/4383
• e456ab1 Merge pull request #4429 from morozov/issues/4428
• 6d151f9 Throw exception on invalid LockMode
• 74bc147 Merge pull request #4400 from BenMorel/with-nolock
• Additional commits viewable in compare view

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