Update dependency memcached/memcached to v1.6.11

This MR contains the following updates:

Package	Type	Update	Change
memcached/memcached	ironbank-github	patch	1.6.10 -> 1.6.11
memcached/memcached		patch	1.6.10 -> 1.6.11

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Release Notes

memcached/memcached

v1.6.11

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