Update drupal

Changes:

- https://github.com/docker-library/drupal/commit/a37e690: Update to 8.8.7

library/drupal

@@ -4,19 +4,19 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/drupal.git
 
-Tags: 8.8.6-apache, 8.8-apache, 8-apache, apache, 8.8.6, 8.8, 8, latest
+Tags: 8.8.7-apache, 8.8-apache, 8-apache, apache, 8.8.7, 8.8, 8, latest
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: 6b0f9aae2811ecf6d0a65cea3a42c8f7d7087b05
+GitCommit: a37e690804a36b6e49205931e8d2b1765b7ea6b5
 Directory: 8.8/apache
 
-Tags: 8.8.6-fpm, 8.8-fpm, 8-fpm, fpm
+Tags: 8.8.7-fpm, 8.8-fpm, 8-fpm, fpm
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: 6b0f9aae2811ecf6d0a65cea3a42c8f7d7087b05
+GitCommit: a37e690804a36b6e49205931e8d2b1765b7ea6b5
 Directory: 8.8/fpm
 
-Tags: 8.8.6-fpm-alpine, 8.8-fpm-alpine, 8-fpm-alpine, fpm-alpine
+Tags: 8.8.7-fpm-alpine, 8.8-fpm-alpine, 8-fpm-alpine, fpm-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 6b0f9aae2811ecf6d0a65cea3a42c8f7d7087b05
+GitCommit: a37e690804a36b6e49205931e8d2b1765b7ea6b5
 Directory: 8.8/fpm-alpine
 
 Tags: 8.7.14-apache, 8.7-apache, 8.7.14, 8.7