Bump mysqlclient from 2.2.4 to 2.2.6

Bumps [mysqlclient](https://github.com/PyMySQL/mysqlclient) from 2.2.4 to 2.2.6.
- [Release notes](https://github.com/PyMySQL/mysqlclient/releases)
- [Changelog](https://github.com/PyMySQL/mysqlclient/blob/main/HISTORY.rst)
- [Commits](https://github.com/PyMySQL/mysqlclient/compare/v2.2.4...v2.2.6)

---
updated-dependencies:
- dependency-name: mysqlclient
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

mysql-requirements.txt

@@ -113,7 +113,7 @@ lxml==5.3.0
     # via lxml-html-clean
 lxml-html-clean==0.4.1
     # via modoboa (pyproject.toml)
-mysqlclient==2.2.4
+mysqlclient==2.2.6
     # via modoboa (pyproject.toml)
 oath==1.4.4
     # via modoboa (pyproject.toml)

pyproject.toml

@@ -88,7 +88,7 @@ dev = [
 	"Werkzeug",
 	"pyOpenSSL"
 ]
-mysql = ["mysqlclient<2.2.5"]
+mysql = ["mysqlclient<2.2.7"]
 postgresql = ["psycopg[binary]>=3.1"]
 test = [
 	"argon2-cffi>=16.1.0",