Bump zope-interface from 6.2 to 6.3

Bumps [zope-interface](https://github.com/zopefoundation/zope.interface) from 6.2 to 6.3.
- [Changelog](https://github.com/zopefoundation/zope.interface/blob/master/CHANGES.rst)
- [Commits](zopefoundation/zope.interface@6.2...6.3)

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

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

requirements.txt

@@ -88,4 +88,4 @@ whichcraft==0.6.1
 wrapt==1.16.0
 yarg==0.1.9
 zope.event==5.0
-zope.interface==6.2
+zope.interface==6.3