Update mongo

Changes:

- https://github.com/docker-library/mongo/commit/91f6ceb: Update to 3.6.12

library/mongo

@@ -25,24 +25,24 @@ GitCommit: 135be00ece480b72826d871f5725214c35a1a9ab
 Directory: 3.4/windows/windowsservercore-1709
 Constraints: windowsservercore-1709
 
-Tags: 3.6.11-xenial, 3.6-xenial, 3-xenial
-SharedTags: 3.6.11, 3.6, 3
+Tags: 3.6.12-xenial, 3.6-xenial, 3-xenial
+SharedTags: 3.6.12, 3.6, 3
 # see http://repo.mongodb.org/apt/ubuntu/dists/xenial/mongodb-org/3.6/multiverse/
 Architectures: amd64, arm64v8
-GitCommit: 757cedc3266e4c93d69b5c7d95cb68296d0f4d21
+GitCommit: 91f6cebf99ab6e822ed37fbdd47b4a11e76a0688
 Directory: 3.6
 
-Tags: 3.6.11-windowsservercore-ltsc2016, 3.6-windowsservercore-ltsc2016, 3-windowsservercore-ltsc2016
-SharedTags: 3.6.11-windowsservercore, 3.6-windowsservercore, 3-windowsservercore, 3.6.11, 3.6, 3
+Tags: 3.6.12-windowsservercore-ltsc2016, 3.6-windowsservercore-ltsc2016, 3-windowsservercore-ltsc2016
+SharedTags: 3.6.12-windowsservercore, 3.6-windowsservercore, 3-windowsservercore, 3.6.12, 3.6, 3
 Architectures: windows-amd64
-GitCommit: 7276b14c1e9b5f83b37f5f452e6a9f293aea2d8b
+GitCommit: 91f6cebf99ab6e822ed37fbdd47b4a11e76a0688
 Directory: 3.6/windows/windowsservercore-ltsc2016
 Constraints: windowsservercore-ltsc2016
 
-Tags: 3.6.11-windowsservercore-1709, 3.6-windowsservercore-1709, 3-windowsservercore-1709
-SharedTags: 3.6.11-windowsservercore, 3.6-windowsservercore, 3-windowsservercore, 3.6.11, 3.6, 3
+Tags: 3.6.12-windowsservercore-1709, 3.6-windowsservercore-1709, 3-windowsservercore-1709
+SharedTags: 3.6.12-windowsservercore, 3.6-windowsservercore, 3-windowsservercore, 3.6.12, 3.6, 3
 Architectures: windows-amd64
-GitCommit: 7276b14c1e9b5f83b37f5f452e6a9f293aea2d8b
+GitCommit: 91f6cebf99ab6e822ed37fbdd47b4a11e76a0688
 Directory: 3.6/windows/windowsservercore-1709
 Constraints: windowsservercore-1709