Bump doctrine/dbal from 2.9.0 to 2.9.1 (koel#878)

Bumps [doctrine/dbal](https://github.com/doctrine/dbal) from 2.9.0 to 2.9.1.
<details>
<summary>Release notes</summary>

*Sourced from [doctrine/dbal's releases](https://github.com/doctrine/dbal/releases).*

> # Release v2.9.1
> 
> [![Build Status](https://travis-ci.org/doctrine/dbal.svg?branch=v2.9.1)](https://travis-ci.org/doctrine/dbal)
> 
> This release fixes regressions introduced in v2.9.0 and issues specific to the SQL Anywhere platform.
> 
> - Total issues resolved: **11**
> 
> **MySQL, Schema Introspection:**
> 
> - [3393: Fixed parsing MySQL create table flags (options without a value)](https://github-redirect.dependabot.com/doctrine/dbal/pull/3393) thanks to [**morozov**](https://github.com/morozov) and [**AdrianSherwood**](https://github.com/AdrianSherwood)
> - [3398: BC Break in 2.9.0 for MySQL Tables containing partitions](https://github-redirect.dependabot.com/doctrine/dbal/issues/3398) thanks to [**bcremer**](https://github.com/bcremer)
> 
> **SQL Anywhere:**
> 
> - [3375: &koel#91;SQL Anywhere&koel#93; Fix bound parameter references in PHP 7](https://github-redirect.dependabot.com/doctrine/dbal/pull/3375) thanks to [**deeky666**](https://github.com/deeky666)
> - [3378: &koel#91;SQL Anywhere&koel#93; Fix query limit values &quot;0&quot; and &quot;null&quot;](https://github-redirect.dependabot.com/doctrine/dbal/pull/3378) thanks to [**deeky666**](https://github.com/deeky666)
> - [3385: &koel#91;SQL Anywhere&koel#93; Fix fetching empty values via fetchAll()](https://github-redirect.dependabot.com/doctrine/dbal/pull/3385) thanks to [**deeky666**](https://github.com/deeky666)
> - [3386: &koel#91;SQL Anywhere&koel#93; Fix view schema introspection test](https://github-redirect.dependabot.com/doctrine/dbal/pull/3386) thanks to [**deeky666**](https://github.com/deeky666)
> 
> **Schema Comparison:**
> 
> - [3382: Reverted strict comparison back to loose because of a new regression](https://github-redirect.dependabot.com/doctrine/dbal/pull/3382) thanks to [**morozov**](https://github.com/morozov) and [**Majkl578**](https://github.com/Majkl578)
> 
> **Connections:**
> 
> - [3305: Fix Fetch mode query in MasterSlaveConnection](https://github-redirect.dependabot.com/doctrine/dbal/pull/3305) thanks to [**BradCrumb**](https://github.com/BradCrumb)
> 
> **Cache:**
> 
> - [3381: ResultCacheStatement lost its cache capability on fetchAll method](https://github-redirect.dependabot.com/doctrine/dbal/pull/3381) thanks to [**roger-codina**](https://github.com/roger-codina)
> 
> **Documentation:**
> 
> - [3392: fixed annotations of parameter $columns in Table](https://github-redirect.dependabot.com/doctrine/dbal/pull/3392) thanks to [**LukasVitek**](https://github.com/LukasVitek) and [**ricardofiorani**](https://github.com/ricardofiorani)
</details>
<details>
<summary>Commits</summary>

- [`ec74d6e`](doctrine/dbal@ec74d6e) Release v2.9.1
- [`f3711a7`](doctrine/dbal@f3711a7) Merge pull request [#3404](https://github-redirect.dependabot.com/doctrine/dbal/issues/3404) from greg0ire/update_chat_link
- [`7ce636b`](doctrine/dbal@7ce636b) Merge branch 'bpo/2.9/#3392' into 2.9
- [`b84603b`](doctrine/dbal@b84603b) Fixed annotation and name of parameter $columnsNames in Table
- [`5d4f933`](doctrine/dbal@5d4f933) Merge branch 'bpo/2.9/#3393' into 2.9
- [`b18f63c`](doctrine/dbal@b18f63c) Fixed parsing MySQL create table flags (options without a value)
- [`62dacc0`](doctrine/dbal@62dacc0) Merge branch 'bpo/2.9/#3381' into 2.9
- [`79e369e`](doctrine/dbal@79e369e) ResultCacheStatement lost its cache capability on fetchAll method
- [`125fb5e`](doctrine/dbal@125fb5e) Merge branch 'bpo/2.9/#3305' into 2.9
- [`f6dd134`](doctrine/dbal@f6dd134) Fix Fetch mode query in MasterSlaveConnection
- Additional commits viewable in [compare view](doctrine/dbal@v2.9.0...v2.9.1)
</details>
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