chore: update requirements

Until [dlint supports flake8>=4](dlint-py/dlint#36) `make update` will fail, and you need to manually fix the version of pyflakes to 2.3.1

Makefile

@@ -35,7 +35,7 @@ update:
   # Sync your virtualenv with the new state
 	python -m piptools sync requirements.txt requirements-dev.txt docs/requirements.txt
 
-  pip install -e .
+	pip install -e .
 
 	@echo ""
 

docs/requirements.txt

@@ -12,11 +12,11 @@ beautifulsoup4==4.10.0
     # via mkdocs-htmlproofer-plugin
 cached-property==1.5.2
     # via pytkdocs
-certifi==2021.5.30
+certifi==2021.10.8
     # via requests
-charset-normalizer==2.0.6
+charset-normalizer==2.0.7
     # via requests
-click==8.0.1
+click==8.0.3
     # via mkdocs
 ghp-import==2.0.2
     # via mkdocs
@@ -26,7 +26,7 @@ gitpython==3.1.24
     # via mkdocs-git-revision-date-localized-plugin
 htmlmin==0.1.12
     # via mkdocs-minify-plugin
-idna==3.2
+idna==3.3
     # via requests
 importlib-metadata==4.8.1
     # via
@@ -36,6 +36,7 @@ importlib-metadata==4.8.1
 jinja2==3.0.2
     # via
     #   mkdocs
+    #   mkdocs-material
     #   mkdocstrings
 jsmin==3.0.0
     # via mkdocs-minify-plugin
@@ -58,7 +59,7 @@ markupsafe==2.0.1
     #   mkdocstrings
 mergedeep==1.3.4
     # via mkdocs
-mkdocs==1.2.2
+mkdocs==1.2.3
     # via
     #   -r docs/requirements.in
     #   mkdocs-autolinks-plugin
@@ -77,7 +78,7 @@ mkdocs-git-revision-date-localized-plugin==0.10.0
     # via -r docs/requirements.in
 mkdocs-htmlproofer-plugin==0.7.0
     # via -r docs/requirements.in
-mkdocs-material==7.3.1
+mkdocs-material==7.3.3
     # via -r docs/requirements.in
 mkdocs-material-extensions==1.0.3
     # via mkdocs-material
@@ -103,7 +104,7 @@ pytkdocs==0.12.0
     # via mkdocstrings
 pytz==2021.3
     # via babel
-pyyaml==5.4.1
+pyyaml==6.0
     # via
     #   mkdocs
     #   pyyaml-env-tag