Bump zope-interface from 8.0 to 8.1

Bumps [zope-interface](https://github.com/zopefoundation/zope.interface) from 8.0 to 8.1.
- [Changelog](https://github.com/zopefoundation/zope.interface/blob/master/CHANGES.rst)
- [Commits](zopefoundation/zope.interface@8.0...8.1)

---
updated-dependencies:
- dependency-name: zope-interface
  dependency-version: '8.1'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

constraints.txt

@@ -42,4 +42,4 @@ typing_extensions==4.14.0
 urllib3==2.5.0
 Werkzeug==0.16.1
 zope.event==6.0
-zope.interface==8.0
+zope.interface==8.1