Bump urllib3 from 2.2.2 to 2.6.3 in /requirements

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.2.2 to 2.6.3.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.2.2...2.6.3)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.6.3
  dependency-type: indirect
...

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

Author: dependabot[bot]

requirements/checkdocs.txt

@@ -47,10 +47,10 @@ packaging==25.0
     #   build
     #   sphinx
 pip-sync-faster==0.0.5
-    # via -r requirements/checkdocs.in
+    # via -r checkdocs.in
 pip-tools==7.5.2
     # via
-    #   -r requirements/checkdocs.in
+    #   -r checkdocs.in
     #   pip-sync-faster
 pygments==2.17.2
     # via sphinx
@@ -68,17 +68,17 @@ snowballstemmer==2.2.0
     # via sphinx
 sphinx==8.2.3
     # via
-    #   -r requirements/checkdocs.in
+    #   -r checkdocs.in
     #   sphinx-autobuild
     #   sphinx-rtd-theme
     #   sphinxcontrib-applehelp
     #   sphinxcontrib-jquery
     #   sphinxcontrib-qthelp
     #   sphinxcontrib-serializinghtml
 sphinx-autobuild==2024.10.3
-    # via -r requirements/checkdocs.in
+    # via -r checkdocs.in
 sphinx-rtd-theme==3.0.2
-    # via -r requirements/checkdocs.in
+    # via -r checkdocs.in
 sphinxcontrib-applehelp==1.0.7
     # via sphinx
 sphinxcontrib-devhelp==2.0.0
@@ -97,7 +97,7 @@ starlette==0.49.1
     # via sphinx-autobuild
 typing-extensions==4.15.0
     # via starlette
-urllib3==2.2.2
+urllib3==2.6.3
     # via requests
 uvicorn==0.29.0
     # via sphinx-autobuild
@@ -113,7 +113,7 @@ zipp==3.19.1
 # The following packages are considered to be unsafe in a requirements file:
 pip==25.3
     # via
-    #   -r requirements/checkdocs.in
+    #   -r checkdocs.in
     #   pip-tools
 setuptools==78.1.1
     # via pip-tools