Bump aiomysql from 0.0.21 to 0.0.22

Bumps [aiomysql](https://github.com/aio-libs/aiomysql) from 0.0.21 to 0.0.22.
- [Release notes](https://github.com/aio-libs/aiomysql/releases)
- [Changelog](https://github.com/aio-libs/aiomysql/blob/master/CHANGES.txt)
- [Commits](https://github.com/aio-libs/aiomysql/commits)

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

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

poetry.lock

@@ -11,7 +11,7 @@ contextvars = {version = "2.4", markers = "python_version < \"3.7\""}
 
 [[package]]
 name = "aiomysql"
-version = "0.0.21"
+version = "0.0.22"
 description = "MySQL driver for asyncio."
 category = "main"
 optional = false
@@ -1550,7 +1550,7 @@ sqlite = []
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6.2"
-content-hash = "ea217945782c948cb209cbad149f9828130bcb011f789019f8c23d165f482425"
+content-hash = "ca037442337d76d6ecc87e88e1924d1071ed06b93d868a32faf6360269972572"
 
 [metadata.files]
 aiocontextvars = [
@@ -1558,8 +1558,8 @@ aiocontextvars = [
     {file = "aiocontextvars-0.2.2.tar.gz", hash = "sha256:f027372dc48641f683c559f247bd84962becaacdc9ba711d583c3871fb5652aa"},
 ]
 aiomysql = [
-    {file = "aiomysql-0.0.21-py3-none-any.whl", hash = "sha256:a81a97da3dd732635926a8ea6adbbf2d1345799680bf61b5f89e730bcec88cc5"},
-    {file = "aiomysql-0.0.21.tar.gz", hash = "sha256:811569c0db118dd2685f0878f5cebf17a11e89a995fa14261d5fa0254113842c"},
+    {file = "aiomysql-0.0.22-py3-none-any.whl", hash = "sha256:4e4a65914daacc40e70f992ddbeef32457561efbad8de41393e8ac5a84126a5a"},
+    {file = "aiomysql-0.0.22.tar.gz", hash = "sha256:9bcf8f26d22e550f75cabd635fa19a55c45f835eea008275960cb37acadd622a"},
 ]
 aiopg = [
     {file = "aiopg-1.3.3-py3-none-any.whl", hash = "sha256:2842dd8741460eeef940032dcb577bfba4d4115205dd82a73ce13b3271f5bf0a"},