Update black.

.pre-commit-config.yaml

@@ -1,5 +1,5 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 22.3.0
+    rev: 23.9.1
     hooks:
     - id: black

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 88
-target-version = ['py36']
+target-version = ['py37']
 include = '\.pyi?$'
 exclude = '''
 /(
@@ -19,4 +19,3 @@ exclude = '''
   | tests/data
 )/
 '''
-

requirements-dev.txt

@@ -1,7 +1,7 @@
 pytest>=2.7.0
 tox>=1.9.2
 behave>=1.2.4
-black>=22.3.0
+black>=23.9.1
 pexpect==3.3; platform_system != "Windows"
 pre-commit>=1.16.0
 coverage>=5.0.4
@@ -10,4 +10,4 @@ docutils>=0.13.1
 autopep8>=1.3.3
 twine>=1.11.0
 wheel>=0.33.6
-sshtunnel>=0.4.0
+sshtunnel>=0.4.0