Simplify requirements.txt to fix new pip resolver issue

requirements.txt

@@ -1,64 +1,7 @@
-alabaster==0.7.12
-appdirs==1.4.4
-Babel==2.9.1
-black==20.8b1
-bleach==3.3.0
-certifi==2020.12.5
-cffi==1.14.5
-cfgv==3.2.0
-chardet==4.0.0
-click==8.0.0
-colorama==0.4.4
+black==21.6b0
 cryptography==3.4.7
-distlib==0.3.1
-docutils==0.17.1
-filelock==3.0.12
-Flask==2.0.0
-identify==2.2.4
-idna==2.10
-imagesize==1.2.0
-importlib-metadata==4.0.1
-itsdangerous==2.0.0
-Jinja2==2.11.3
-keyring==23.0.1
-MarkupSafe==1.1.1
-mypy-extensions==0.4.3
-nodeenv==1.6.0
-packaging==20.9
-Pallets-Sphinx-Themes==2.0.0
-pathspec==0.8.1
-pkginfo==1.7.0
-pluggy==0.13.1
-pre-commit==2.12.1
-py==1.10.0
-pycparser==2.20
-Pygments==2.9.0
-PyJWT==2.1.0
-pyparsing==2.4.7
-pytz==2021.1
-PyYAML==5.4.1
-readme-renderer==29.0
-regex==2021.4.4
-requests==2.25.1
-requests-toolbelt==0.9.1
-rfc3986==1.5.0
-six==1.16.0
-snowballstemmer==2.1.0
-Sphinx==4.0.1
-sphinxcontrib-applehelp==1.0.2
-sphinxcontrib-devhelp==1.0.2
-sphinxcontrib-htmlhelp==1.0.3
-sphinxcontrib-jsmath==1.0.1
-sphinxcontrib-qthelp==1.0.3
-sphinxcontrib-serializinghtml==1.1.4
-toml==0.10.2
+Flask==2.0.1
+Pallets-Sphinx-Themes==2.0.1
+pre-commit==2.13.0
+Sphinx==4.0.2
 tox==3.23.1
-tqdm==4.60.0
-twine==3.4.1
-typed-ast==1.4.3
-typing-extensions==3.10.0.0
-urllib3==1.26.5
-virtualenv==20.4.6
-webencodings==0.5.1
-Werkzeug==2.0.0
-zipp==3.4.1