Update mariadb

Changes:

- https://github.com/docker-library/mariadb/commit/bf675ca: Update to 1:10.2.27+maria~bionic
- https://github.com/docker-library/mariadb/commit/5385ad0: Update to 1:10.3.18+maria~bionic
- https://github.com/docker-library/mariadb/commit/ac33a49: Update to 1:10.4.8+maria~bionic
- https://github.com/docker-library/mariadb/commit/36e86c0: Update generated README

library/mariadb

@@ -4,19 +4,19 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/mariadb.git
 
-Tags: 10.4.7-bionic, 10.4-bionic, 10-bionic, bionic, 10.4.7, 10.4, 10, latest
+Tags: 10.4.8-bionic, 10.4-bionic, 10-bionic, bionic, 10.4.8, 10.4, 10, latest
 Architectures: amd64, arm64v8, ppc64le
-GitCommit: a540b4bb336f8dce06cbad76d450b7aa3e142ff9
+GitCommit: ac33a49fe9b98f69ee95f39bf4493e38f9eb8852
 Directory: 10.4
 
-Tags: 10.3.17-bionic, 10.3-bionic, 10.3.17, 10.3
+Tags: 10.3.18-bionic, 10.3-bionic, 10.3.18, 10.3
 Architectures: amd64, arm64v8, ppc64le
-GitCommit: 58a336f5cfeb4e33ae28e59178cb25e2ce7991e6
+GitCommit: 5385ad04e294cf218d5a1ec23cacb336d1d42af2
 Directory: 10.3
 
-Tags: 10.2.26-bionic, 10.2-bionic, 10.2.26, 10.2
+Tags: 10.2.27-bionic, 10.2-bionic, 10.2.27, 10.2
 Architectures: amd64, arm64v8, ppc64le
-GitCommit: 83aeb3c809c45819f6c0666cb9ce69f70cb49844
+GitCommit: bf675caa56e4a1b462c665d1cded137f13c33753
 Directory: 10.2
 
 Tags: 10.1.41-bionic, 10.1-bionic, 10.1.41, 10.1