Update postgres

Changes:

- https://github.com/docker-library/postgres/commit/9586595: Merge pull request https://github.com/docker-library/postgres/pull/742 from J0WI/alpine-3.12
- https://github.com/docker-library/postgres/commit/b1f60bd: Upgrade Alpine to 3.12

library/postgres

@@ -11,7 +11,7 @@ Directory: 13
 
 Tags: 13-beta1-alpine, 13-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: b96659493b841100dc75ed777bff01913d9fe9e1
+GitCommit: b1f60bd4f88fa2f82aaaa304dc1476a26938cb38
 Directory: 13/alpine
 
 Tags: 12.3, 12, latest
@@ -21,7 +21,7 @@ Directory: 12
 
 Tags: 12.3-alpine, 12-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 4edbda205c684c861e6fbf964de5d00845864d42
+GitCommit: b1f60bd4f88fa2f82aaaa304dc1476a26938cb38
 Directory: 12/alpine
 
 Tags: 11.8, 11
@@ -31,7 +31,7 @@ Directory: 11
 
 Tags: 11.8-alpine, 11-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 0de8bbbcdcdd7783acb7ce2678c85d5aab977c55
+GitCommit: b1f60bd4f88fa2f82aaaa304dc1476a26938cb38
 Directory: 11/alpine
 
 Tags: 10.13, 10
@@ -41,7 +41,7 @@ Directory: 10
 
 Tags: 10.13-alpine, 10-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 245058ccb66fd6cb34fc512323f20ed676f1af15
+GitCommit: b1f60bd4f88fa2f82aaaa304dc1476a26938cb38
 Directory: 10/alpine
 
 Tags: 9.6.18, 9.6, 9
@@ -51,7 +51,7 @@ Directory: 9.6
 
 Tags: 9.6.18-alpine, 9.6-alpine, 9-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 7675803cba8dbf4aca2c1064b044b03cd0db6c2d
+GitCommit: b1f60bd4f88fa2f82aaaa304dc1476a26938cb38
 Directory: 9.6/alpine
 
 Tags: 9.5.22, 9.5
@@ -61,5 +61,5 @@ Directory: 9.5
 
 Tags: 9.5.22-alpine, 9.5-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 5104b38a3a159aad42014d69b3ba1a0c4d22ca4d
+GitCommit: b1f60bd4f88fa2f82aaaa304dc1476a26938cb38
 Directory: 9.5/alpine