Bump urllib3 from 2.6.2 to 2.6.3 in /docassemble_base

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.6.2 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@2.6.2...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]

docassemble_base/pyproject.toml

@@ -196,7 +196,7 @@ dependencies = [
   "ua-parser==1.0.1",
   "ua-parser-builtins==0.18.0.post1",
   "uritemplate==4.2.0",
-  "urllib3==2.6.2",
+  "urllib3==2.6.3",
   "us==3.2.0",
   "user-agents==2.2.0",
   "wcwidth==0.2.14",