Update urllib3 requirement from <2 to <3

Updates the requirements on [urllib3](https://github.com/urllib3/urllib3) to permit the latest version.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@0.3...2.6.3)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.6.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,7 +1,7 @@
 # Fix an issue with the OCIO's Linux container images that have OpenSSL under 1.1.1.
 # If the container images are updated with OpenSSL 1.1.1+, the restriction on
 # urllib3 version <2 can be removed.
-urllib3<2
+urllib3<3
 # The builds for documentation fails with <0.18.0
 docutils>=0.18.1
 sphinx<=7.1.2

pyproject.toml

@@ -5,7 +5,7 @@ requires = [
     "cmake>=3.14",
     "ninja; sys_platform != 'win32' and platform_machine != 'arm64'",
     # Documentation requirements (see docs/requirements.txt for details)
-    "urllib3<2",
+    "urllib3<3",
     "docutils>=0.18.1",
     "sphinx<=7.1.2",
     "six",