build(deps): Update django-bootstrap3 requirement (#1541)

Updates the requirements on [django-bootstrap3](https://github.com/zostera/django-bootstrap3) to permit the latest version.
- [Changelog](https://github.com/zostera/django-bootstrap3/blob/main/CHANGELOG.md)
- [Commits](zostera/django-bootstrap3@v25.1...v26.1)

---
updated-dependencies:
- dependency-name: django-bootstrap3
  dependency-version: '26.1'
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -25,7 +25,7 @@ dependencies = [
     "django-anymail>=13.0,<15.0",
 
     # UI & Templates
-    "django-bootstrap3>=25.1,<26.0",
+    "django-bootstrap3>=25.1,<27.0",
     "django-active-link>=0.2.2,<0.4.0",
     "django-html5>=1.0.0,<2.0.0",
     "django-meta>=2.5.0,<3.0.0",