chore(deps): update docker.io/library/memcached:1.6.17 docker digest to d20c577 (#837)

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 305a21f..a7c8398 100644
--- a/roles/defaults/vars/main.yml
+++ b/roles/defaults/vars/main.yml
@@ -110,7 +110,7 @@
   manila_db_sync: ghcr.io/vexxhost/atmosphere/manila:zed@sha256:3d634658904c15beb5c5079b0b9026f5467eb1cd6f944f019a3057120e5e89be
   manila_scheduler: ghcr.io/vexxhost/atmosphere/manila:zed@sha256:3d634658904c15beb5c5079b0b9026f5467eb1cd6f944f019a3057120e5e89be
   manila_share: ghcr.io/vexxhost/atmosphere/manila:zed@sha256:3d634658904c15beb5c5079b0b9026f5467eb1cd6f944f019a3057120e5e89be
-  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: ghcr.io/vexxhost/atmosphere/neutron:zed@sha256:e4b51997412d159ceac09b8899eee6ba58565aca0e27d39b57a3ddd56b1c9a9e
   neutron_bgp_dragent: ghcr.io/vexxhost/atmosphere/neutron:zed@sha256:e4b51997412d159ceac09b8899eee6ba58565aca0e27d39b57a3ddd56b1c9a9e