Make test runner compatible with Python 3.11 (#2915)

**NB**: this PR doesn't update Python to 3.11; it makes tests
compatible with it and fixes a couple of warnings by updating 
dependencies.

- `poetry add asyncpg@latest` to fix `./scripts/pysync`
- `poetry add boto3@latest "boto3-stubs[s3]@latest"` to fix
```
DeprecationWarning: 'cgi' is deprecated and slated for removal in Python 3.13
```
- `poetry update certifi` to fix
```
DeprecationWarning: path is deprecated. Use files() instead. Refer to https://importlib-resources.readthedocs.io/en/latest/using.html#migrating-from-legacy for migration advice.
```
- Move `types-toml` from `dep-dependencies` to `dependencies` to keep it
aligned with other `types-*` deps

pyproject.toml

@@ -12,13 +12,13 @@ typing-extensions = "^4.1.0"
 PyJWT = {version = "^2.1.0", extras = ["crypto"]}
 requests = "^2.26.0"
 pytest-xdist = "^3.0.2"
-asyncpg = "^0.24.0"
+asyncpg = "^0.27.0"
 aiopg = "^1.3.1"
 Jinja2 = "^3.0.2"
 types-requests = "^2.28.5"
 types-psycopg2 = "^2.9.18"
-boto3 = "^1.20.40"
-boto3-stubs = {version = "^1.23.38", extras = ["s3"]}
+boto3 = "^1.26.16"
+boto3-stubs = {extras = ["s3"], version = "^1.26.16"}
 moto = {version = "^3.0.0", extras = ["server"]}
 backoff = "^1.11.1"
 pytest-lazy-fixture = "^0.6.3"
@@ -31,13 +31,13 @@ pytest-asyncio = "^0.19.0"
 toml = "^0.10.2"
 psutil = "^5.9.4"
 types-psutil = "^5.9.5.4"
+types-toml = "^0.10.8"
 
 [tool.poetry.dev-dependencies]
 flake8 = "^5.0.4"
 mypy = "==0.971"
 black = "^22.6.0"
 isort = "^5.10.1"
-types-toml = "^0.10.8"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]