chore(deps): update docker.io/library/memcached:1.6.17 docker digest to d20c577 (#822)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
diff --git a/roles/defaults/vars/main.yml b/roles/defaults/vars/main.yml
index 2379dbe..376e1e8 100644
--- a/roles/defaults/vars/main.yml
+++ b/roles/defaults/vars/main.yml
@@ -110,7 +110,7 @@
   manila_db_sync: quay.io/vexxhost/manila:zed@sha256:59c3bc27b6cf0740a4c87cbbd23b883bf7fa536659ac90f5aa765ad931e53e9e
   manila_scheduler: quay.io/vexxhost/manila:zed@sha256:59c3bc27b6cf0740a4c87cbbd23b883bf7fa536659ac90f5aa765ad931e53e9e
   manila_share: quay.io/vexxhost/manila:zed@sha256:59c3bc27b6cf0740a4c87cbbd23b883bf7fa536659ac90f5aa765ad931e53e9e
-  memcached: docker.io/library/memcached:1.6.17@sha256:db45886d2d48f143be64f2d46407e224b0b61df3b0056b9d5b03e8bc6a7cd74e
+  memcached: docker.io/library/memcached:1.6.17@sha256:d20c577c08863b09b21ecd21d0384d0a800f39d82f37045b3608f677a0a9400f
   netoffload: ghcr.io/vexxhost/netoffload:v1.0.1@sha256:60f092e5d5f156c2f933c199ea72274f80eb758d3e0dc2f2b1be62174c3f7183
   neutron_bagpipe_bgp: quay.io/vexxhost/neutron:zed@sha256:4eec4493d3026abe2847d4c9efde292e4bb703bd04a1b4dc789cb008a3de68a9
   neutron_bgp_dragent: quay.io/vexxhost/neutron:zed@sha256:4eec4493d3026abe2847d4c9efde292e4bb703bd04a1b4dc789cb008a3de68a9