Bump black from 21.6b0 to 21.7b0

Bumps [black](https://github.com/psf/black) from 21.6b0 to 21.7b0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:development
...

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

poetry.lock

@@ -30,7 +30,7 @@ tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>
 
 [[package]]
 name = "black"
-version = "21.6b0"
+version = "21.7b0"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
@@ -42,7 +42,7 @@ click = ">=7.1.2"
 mypy-extensions = ">=0.4.3"
 pathspec = ">=0.8.1,<1"
 regex = ">=2020.1.8"
-toml = ">=0.10.1"
+tomli = ">=0.2.6,<2.0.0"
 typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\""}
 typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
 
@@ -328,6 +328,14 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "tomli"
+version = "1.0.4"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
 [[package]]
 name = "tox"
 version = "3.24.0"
@@ -401,7 +409,7 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "cd71b59aa3b2f7d21e1489f43927516f276326a691ba6b08e4175b33df594a4c"
+content-hash = "0d00ff2ebd3af33ef2f06b72eb5f225c3c4d467ebe1a556b1f57bae513ca4752"
 
 [metadata.files]
 appdirs = [
@@ -417,8 +425,8 @@ attrs = [
     {file = "attrs-20.2.0.tar.gz", hash = "sha256:26b54ddbbb9ee1d34d5d3668dd37d6cf74990ab23c828c2888dccdceee395594"},
 ]
 black = [
-    {file = "black-21.6b0-py3-none-any.whl", hash = "sha256:dfb8c5a069012b2ab1e972e7b908f5fb42b6bbabcba0a788b86dc05067c7d9c7"},
-    {file = "black-21.6b0.tar.gz", hash = "sha256:dc132348a88d103016726fe360cb9ede02cecf99b76e3660ce6c596be132ce04"},
+    {file = "black-21.7b0-py3-none-any.whl", hash = "sha256:1c7aa6ada8ee864db745b22790a32f94b2795c253a75d6d9b5e439ff10d23116"},
+    {file = "black-21.7b0.tar.gz", hash = "sha256:c8373c6491de9362e39271630b65b964607bc5c79c83783547d76c839b3aa219"},
 ]
 bw-sphinxtheme = [
     {file = "bw_sphinxtheme-0.1.8.tar.gz", hash = "sha256:dde9d9003e044367c28a8a63ee0c38fb53306241b71a04abb97a567f2ddefca9"},
@@ -630,6 +638,10 @@ toml = [
     {file = "toml-0.10.1-py2.py3-none-any.whl", hash = "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"},
     {file = "toml-0.10.1.tar.gz", hash = "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f"},
 ]
+tomli = [
+    {file = "tomli-1.0.4-py3-none-any.whl", hash = "sha256:0713b16ff91df8638a6a694e295c8159ab35ba93e3424a626dd5226d386057be"},
+    {file = "tomli-1.0.4.tar.gz", hash = "sha256:be670d0d8d7570fd0ea0113bd7bb1ba3ac6706b4de062cc4c952769355c9c268"},
+]
 tox = [
     {file = "tox-3.24.0-py2.py3-none-any.whl", hash = "sha256:c990028355f0d0b681e3db9baa89dd9f839a6e999c320029339f6a6b36160591"},
     {file = "tox-3.24.0.tar.gz", hash = "sha256:67636634df6569e450c4bc18fdfd8b84d7903b3902d5c65416eb6735f3d4afb8"},

pyproject.toml

@@ -34,7 +34,7 @@ python = "^3.7"
 pytest = "^6.2"
 pytest-cov = "^2.12"
 pytest-runner = "^5.3"
-black = { version = "^21.6b0", python = "^3.7" }
+black = { version = "^21.7b0", python = "^3.7" }
 mypy = "0.910"
 pre-commit = "^2.13"
 bw_sphinxtheme = "^0.1.8"