Bump python-memcached from 1.59 to 1.61 (#8776)

Bumps [python-memcached](https://github.com/linsomniac/python-memcached) from 1.59 to 1.61.
- [Release notes](https://github.com/linsomniac/python-memcached/releases)
- [Changelog](https://github.com/linsomniac/python-memcached/blob/master/ChangeLog)
- [Commits](linsomniac/python-memcached@1.59...1.61)

---
updated-dependencies:
- dependency-name: python-memcached
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/extras/pymemcache.txt

@@ -1 +1 @@
-python-memcached==1.59
+python-memcached==1.61