Update memcached

Changes:

- https://github.com/docker-library/memcached/commit/2f7d163: Apply https://github.com/memcached/memcached/commit/7e570c789f4473354461e6eeb8bb7a283df613bf directly instead of sed
- https://github.com/docker-library/memcached/commit/4396d78: Merge pull request https://github.com/docker-library/memcached/pull/72 from infosiftr/update
- https://github.com/docker-library/memcached/commit/fed47a9: Update to 1.6.12

library/memcached

@@ -4,12 +4,12 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/memcached.git
 
-Tags: 1.6.10, 1.6, 1, latest, 1.6.10-buster, 1.6-buster, 1-buster, buster
+Tags: 1.6.12, 1.6, 1, latest, 1.6.12-buster, 1.6-buster, 1-buster, buster
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: 1a01e364e20f571700e35e1ba8906a59ea4561b8
+GitCommit: fed47a936a307aa1e0be990a59ae4de71f134ca5
 Directory: debian
 
-Tags: 1.6.10-alpine, 1.6-alpine, 1-alpine, alpine, 1.6.10-alpine3.14, 1.6-alpine3.14, 1-alpine3.14, alpine3.14
+Tags: 1.6.12-alpine, 1.6-alpine, 1-alpine, alpine, 1.6.12-alpine3.14, 1.6-alpine3.14, 1-alpine3.14, alpine3.14
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 1a01e364e20f571700e35e1ba8906a59ea4561b8
+GitCommit: 2f7d163ec21401699a4f87e6e293b2ed45227598
 Directory: alpine