Dependency update (#421)

* Update setuptools from 54.2.0 to 56.0.0

* Update pre-commit from 2.11.1 to 2.12.1

* Update pip from 21.0.1 to 21.1

* Update sphinx_gallery from 0.8.2 to 0.9.0

Co-authored-by: pyup-bot <github-bot@pyup.io>

Author: nkorinek

dev-requirements.txt

@@ -1,14 +1,14 @@
 bumpversion==0.6.0
 sphinx_rtd_theme==0.5.2
-sphinx_gallery==0.8.2
+sphinx_gallery==0.9.0
 sphinx-autobuild==2021.3.14
 pytest-vcr==1.0.2
 pytest-cov==2.11.1
 codecov==2.1.11
 pytest==6.2.3
-setuptools==54.2.0
-pre-commit==2.11.1
-pip==21.0.1
+setuptools==56.0.0
+pre-commit==2.12.1
+pip==21.1
 descartes==1.1.0
 seaborn>=0.9.1
 pillow==8.2.0