build(deps): bump urllib3 in /helm-chart/images/binderhub

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.3 to 1.26.4.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.3...1.26.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

helm-chart/images/binderhub/requirements.txt

@@ -24,12 +24,8 @@ chardet==4.0.0
     # via requests
 cryptography==3.4.4
     # via pyopenssl
-docker==4.4.1
-    # via -r binderhub.in
 entrypoints==0.3
     # via jupyterhub
-escapism==1.0.1
-    # via -r binderhub.in
 google-api-core[grpc]==1.26.0
     # via
     #   google-cloud-core
@@ -52,23 +48,15 @@ idna==2.10
 ipython-genutils==0.2.0
     # via traitlets
 jinja2==2.11.3
-    # via
-    #   -r binderhub.in
-    #   jupyterhub
+    # via jupyterhub
 jsonschema==3.2.0
-    # via
-    #   -r binderhub.in
-    #   jupyter-telemetry
+    # via jupyter-telemetry
 jupyter-telemetry==0.1.0
     # via jupyterhub
 jupyterhub==1.2.2
-    # via
-    #   -r binderhub.in
-    #   -r requirements.in
+    # via -r requirements.in
 kubernetes==9.0.1
-    # via
-    #   -r binderhub.in
-    #   -r requirements.in
+    # via -r requirements.in
 mako==1.1.4
     # via alembic
 markupsafe==1.1.1
@@ -84,9 +72,7 @@ packaging==20.9
 pamela==1.0.0
     # via jupyterhub
 prometheus-client==0.9.0
-    # via
-    #   -r binderhub.in
-    #   jupyterhub
+    # via jupyterhub
 protobuf==3.14.0
     # via
     #   google-api-core
@@ -113,9 +99,7 @@ python-dateutil==2.8.1
 python-editor==1.0.4
     # via alembic
 python-json-logger==2.0.1
-    # via
-    #   -r binderhub.in
-    #   jupyter-telemetry
+    # via jupyter-telemetry
 pytz==2021.1
     # via google-api-core
 pyyaml==5.4.1
@@ -124,20 +108,16 @@ requests-oauthlib==1.3.0
     # via kubernetes
 requests==2.25.1
     # via
-    #   docker
     #   google-api-core
     #   jupyterhub
     #   kubernetes
     #   requests-oauthlib
 rsa==4.7
     # via google-auth
-ruamel.yaml.clib==0.2.2
-    # via ruamel.yaml
 ruamel.yaml==0.16.12
     # via jupyter-telemetry
 six==1.15.0
     # via
-    #   docker
     #   google-api-core
     #   google-auth
     #   google-cloud-core
@@ -153,22 +133,17 @@ sqlalchemy==1.3.23
     #   alembic
     #   jupyterhub
 tornado==6.1
-    # via
-    #   -r binderhub.in
-    #   jupyterhub
+    # via jupyterhub
 traitlets==5.0.5
     # via
-    #   -r binderhub.in
     #   jupyter-telemetry
     #   jupyterhub
-urllib3==1.26.3
+urllib3==1.26.4
     # via
     #   kubernetes
     #   requests
 websocket-client==0.57.0
-    # via
-    #   docker
-    #   kubernetes
+    # via kubernetes
 
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools