Bump babel from 2.9.0 to 2.9.1

Bumps [babel](https://github.com/python-babel/babel) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES)
- [Commits](python-babel/babel@v2.9.0...v2.9.1)

---
updated-dependencies:
- dependency-name: babel
  dependency-type: indirect
...

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

requirements-dev.txt

@@ -12,14 +12,13 @@ async-generator==1.10
     # via
     #   pytest-trio
     #   trio
-    #   trio-websocket (setup.py)
 attrs==20.3.0
     # via
     #   -r requirements-dev.in
     #   outcome
     #   pytest
     #   trio
-babel==2.9.0
+babel==2.9.1
     # via sphinx
 bleach==3.2.1
     # via readme-renderer
@@ -40,15 +39,15 @@ coverage==5.3
 coveralls==2.1.2
     # via -r requirements-dev.in
 cryptography==3.2.1
-    # via trustme
+    # via
+    #   secretstorage
+    #   trustme
 docopt==0.6.2
     # via coveralls
 docutils==0.16
     # via
     #   readme-renderer
     #   sphinx
-h11==0.11.0
-    # via wsproto
 idna==2.10
     # via
     #   requests
@@ -60,6 +59,10 @@ iniconfig==1.1.1
     # via pytest
 isort==5.6.4
     # via pylint
+jeepney==0.7.1
+    # via
+    #   keyring
+    #   secretstorage
 jinja2==2.11.2
     # via sphinx
 keyring==21.5.0
@@ -99,29 +102,31 @@ pylint==2.6.0
     # via -r requirements-dev.in
 pyparsing==2.4.7
     # via packaging
-pytest-cov==2.10.1
-    # via -r requirements-dev.in
-pytest-trio==0.7.0
-    # via -r requirements-dev.in
 pytest==6.1.2
     # via
     #   -r requirements-dev.in
     #   pytest-cov
     #   pytest-trio
+pytest-cov==2.10.1
+    # via -r requirements-dev.in
+pytest-trio==0.7.0
+    # via -r requirements-dev.in
 pytz==2020.4
     # via babel
 readme-renderer==28.0
     # via twine
-requests-toolbelt==0.9.1
-    # via twine
 requests==2.25.0
     # via
     #   coveralls
     #   requests-toolbelt
     #   sphinx
     #   twine
+requests-toolbelt==0.9.1
+    # via twine
 rfc3986==1.4.0
     # via twine
+secretstorage==3.3.1
+    # via keyring
 six==1.15.0
     # via
     #   astroid
@@ -135,13 +140,13 @@ snowballstemmer==2.0.0
     # via sphinx
 sortedcontainers==2.3.0
     # via trio
-sphinx-rtd-theme==0.5.0
-    # via -r requirements-dev.in
 sphinx==3.3.1
     # via
     #   -r requirements-dev.in
     #   sphinx-rtd-theme
     #   sphinxcontrib-trio
+sphinx-rtd-theme==0.5.0
+    # via -r requirements-dev.in
 sphinxcontrib-applehelp==1.0.2
     # via sphinx
 sphinxcontrib-devhelp==1.0.2
@@ -167,7 +172,6 @@ trio==0.17.0
     # via
     #   -r requirements-dev.in
     #   pytest-trio
-    #   trio-websocket (setup.py)
 trustme==0.6.0
     # via -r requirements-dev.in
 twine==3.2.0
@@ -178,8 +182,6 @@ webencodings==0.5.1
     # via bleach
 wrapt==1.12.1
     # via astroid
-wsproto==0.15.0
-    # via trio-websocket (setup.py)
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip