Bump the all group in /dependabot with 2 updates

Bumps the all group in /dependabot with 2 updates: [zope-testrunner](https://github.com/zopefoundation/zope.testrunner) and [coverage](https://github.com/nedbat/coveragepy).


Updates `zope-testrunner` from 6.5 to 6.6
- [Changelog](https://github.com/zopefoundation/zope.testrunner/blob/master/CHANGES.rst)
- [Commits](zopefoundation/zope.testrunner@6.5...6.6)

Updates `coverage` from 7.6.3 to 7.6.4
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.3...7.6.4)

---
updated-dependencies:
- dependency-name: zope-testrunner
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all
...

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

dependabot/requirements.txt

@@ -58,7 +58,7 @@ zope.structuredtext==5.0
 zope.tal==5.0.1
 zope.tales==6.0
 zope.testing==5.0.1
-zope.testrunner==6.5
+zope.testrunner==6.6
 zope.traversing==5.0
 zope.untrustedpython==6.1
 zope.viewlet==5.0
@@ -77,7 +77,7 @@ transaction==5.0
 zc.lockfile==3.0.post1
 zodbpickle==4.1.1
 six==1.16.0
-coverage==7.6.3
+coverage==7.6.4
 manuel==1.12.4
 collective.recipe.cmd==0.11
 mr.developer==2.0.2