Update dependencies

Notable sub-dependency update to pydantic 1.9.0, which adds Python 3.10
support, mypy 0.9xx support, and mypy plugin pyproject.toml support.
https://github.com/samuelcolvin/pydantic/releases/tag/v1.9.0

```text
❯ poetry update

Updating dependencies
Resolving dependencies... (35.0s)

Writing lock file

Package operations: 0 installs, 25 updates, 1 removal

  - Removing backports.entry-points-selectable (1.1.0)
  - Updating zipp (3.6.0 -> 3.7.0)
  - Updating importlib-metadata (4.8.1 -> 4.10.0)
  - Updating pyparsing (3.0.0 -> 3.0.6)
  - Updating attrs (21.2.0 -> 21.4.0)
  - Updating distlib (0.3.3 -> 0.3.4)
  - Updating filelock (3.3.1 -> 3.4.2)
  - Updating jinja2 (3.0.2 -> 3.0.3)
  - Updating markdown (3.3.4 -> 3.3.6)
  - Updating packaging (21.0 -> 21.3)
  - Updating platformdirs (2.4.0 -> 2.4.1)
  - Updating py (1.10.0 -> 1.11.0)
  - Updating tomli (1.2.1 -> 1.2.3)
  - Updating typing-extensions (3.10.0.2 -> 4.0.1)
  - Updating charset-normalizer (2.0.7 -> 2.0.9)
  - Updating coverage (6.0.2 -> 6.2)
  - Updating identify (2.3.1 -> 2.4.1)
  - Updating pygments (2.10.0 -> 2.11.1)
  - Updating pymdown-extensions (9.0 -> 9.1)
  - Updating python-dotenv (0.19.1 -> 0.19.2)
  - Updating regex (2021.10.23 -> 2021.11.10)
  - Updating virtualenv (20.9.0 -> 20.12.0)
  - Updating websockets (10.0 -> 10.1)
  - Updating isort (5.9.3 -> 5.10.1)
  - Updating mkdocs-material (7.3.4 -> 7.3.6)
  - Updating pre-commit (2.15.0 -> 2.16.0)

❯ poetry add black@'21.12b0' --allow-prereleases --dev

Updating dependencies
Resolving dependencies... (0.6s)

Writing lock file

Package operations: 0 installs, 1 update, 1 removal

  - Removing regex (2021.11.10)
  - Updating black (21.9b0 -> 21.12b0)

❯ pre-commit autoupdate
Updating https://github.com/psf/black ... updating 21.9b0 -> 21.12b0.
Updating https://github.com/pycqa/flake8 ... already up to date.
Updating https://github.com/pycqa/isort ... updating 5.9.3 -> 5.10.1.
Updating https://github.com/pre-commit/mirrors-prettier ... updating v2.4.1 -> v2.5.1.
Updating https://github.com/pre-commit/pre-commit-hooks ... updating v4.0.1 -> v4.1.0.
```

.pre-commit-config.yaml

@@ -2,7 +2,7 @@ minimum_pre_commit_version: 2.8.0
 default_stages: [commit, push, manual]
 repos:
   - repo: https://github.com/psf/black
-    rev: 21.9b0
+    rev: 21.12b0
     hooks:
       - id: black
   - repo: https://github.com/pycqa/flake8
@@ -11,7 +11,7 @@ repos:
       - id: flake8
         args: [--max-line-length=88]
   - repo: https://github.com/pycqa/isort
-    rev: 5.9.3
+    rev: 5.10.1
     hooks:
       - id: isort
         args: [--filter-files]
@@ -21,11 +21,11 @@ repos:
       - id: mypy
         language: system
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v2.4.1
+    rev: v2.5.1
     hooks:
       - id: prettier
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.0.1
+    rev: v4.1.0
     hooks:
       - id: check-added-large-files
         args: [--maxkb=800]