Update python-memcached requirement from <=1.59 to <=1.61

Updates the requirements on [python-memcached](https://github.com/linsomniac/python-memcached) to permit the latest version.
- [Release notes](https://github.com/linsomniac/python-memcached/releases)
- [Changelog](https://github.com/linsomniac/python-memcached/blob/master/ChangeLog)
- [Commits](linsomniac/python-memcached@release-1.49...1.61)

---
updated-dependencies:
- dependency-name: python-memcached
  dependency-type: direct:production
...

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

requirements.txt

@@ -116,7 +116,7 @@ google-cloud-core==2.3.3
 boto3==1.34.15
 
 # Django Caches
-python-memcached<=1.59
+python-memcached<=1.61
 whitenoise==6.6.0
 Brotli==1.1.0