Release v2.8.1

This release backports the bug fixes implemented in newer DBAL versions.

- Total issues resolved: **8**

**PostgreSQL:**

- [3158: postgres: correctly produce alter table sql comment to update column definition](https://github.com/doctrine/dbal/pull/3158) thanks to @bendavies
- [3226: Ignore case when matching ARRAY](https://github.com/doctrine/dbal/pull/3226) thanks to @ohvitorino
- [3268: Force Sequence::$initialValue type](https://github.com/doctrine/dbal/pull/3268) thanks to @vpArth

**Oracle:**

- [3297: Do not generate SID or SERVICE_NAME when dbname or service name is not specified](https://github.com/doctrine/dbal/pull/3297) thanks to @morozov and @lcp0578
- [3330: Fixed quoting of string literals containing backslash](https://github.com/doctrine/dbal/pull/3330) thanks to @morozov

**SQL Anywhere:**

- [3362: [SQL Anywhere] Disable exact row count retrieval on SQL Anywhere](https://github.com/doctrine/dbal/pull/3362) thanks to @deeky666

**Continuous Integration:**

- [3327: Use locked version of PHPStan to avoid accidental build failures](https://github.com/doctrine/dbal/pull/3327) thanks to @morozov