Bump nsmithuk/local-kms from 3.11.7 to 3.12.0 in /.github/docker

Bumps nsmithuk/local-kms from 3.11.7 to 3.12.0.

---
updated-dependencies:
- dependency-name: nsmithuk/local-kms
  dependency-version: 3.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/docker/docker-compose.yaml

@@ -88,7 +88,7 @@ services:
   localkms:
     network_mode: "host"
     profiles: ['localkms']
-    image: ${KMS_IMAGE:-nsmithuk/local-kms:3.11.7}
+    image: ${KMS_IMAGE:-nsmithuk/local-kms:3.12.0}
   mongo:
     network_mode: "host"
     profiles: ['mongo', 'ceph']