Bump tornado from 6.4.1 to 6.4.2 in /docs

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.4.1 to 6.4.2.
- [Changelog](https://github.com/tornadoweb/tornado/blob/v6.4.2/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.4.1...v6.4.2)

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

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

docs/requirements.txt

@@ -4,8 +4,6 @@ anyio==4.6.2.post1
     # via
     #   httpx
     #   jupyter-server
-appnope==0.1.4
-    # via ipykernel
 argon2-cffi==23.1.0
     # via jupyter-server
 argon2-cffi-bindings==21.2.0
@@ -127,7 +125,7 @@ json5==0.9.28
     # via jupyterlab-server
 jsonpointer==3.0.0
     # via jsonschema
-jsonschema==4.23.0
+jsonschema[format-nongpl]==4.23.0
     # via
     #   jupyter-events
     #   jupyterlab-server
@@ -227,15 +225,15 @@ mkdocs-get-deps==0.2.0
     # via mkdocs
 mkdocs-macros-plugin==1.3.7
     # via -r requirements.in
-mkdocs-material==9.5.45
+mkdocs-material[imaging]==9.5.45
     # via -r requirements.in
 mkdocs-material-extensions==1.3.1
     # via mkdocs-material
 mkdocs-minify-plugin==0.8.0
     # via -r requirements.in
 mkdocs-simple-hooks==0.1.5
     # via -r requirements.in
-mkdocstrings==0.27.0
+mkdocstrings[python-legacy]==0.27.0
     # via
     #   -r requirements.in
     #   mkdocstrings-python-legacy
@@ -374,8 +372,6 @@ rpds-py==0.21.0
     #   referencing
 send2trash==1.8.3
     # via jupyter-server
-setuptools==75.6.0
-    # via jupyterlab
 six==1.16.0
     # via
     #   asttokens
@@ -402,7 +398,7 @@ tinycss2==1.4.0
     #   cairosvg
     #   cssselect2
     #   nbconvert
-tornado==6.4.1
+tornado==6.4.2
     # via
     #   ipykernel
     #   jupyter-client