Bump scality/vault from 7.76.0 to 7.85.0 in /.github/docker

Bumps scality/vault from 7.76.0 to 7.85.0.

---
updated-dependencies:
- dependency-name: scality/vault
  dependency-version: 7.85.0
  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

@@ -111,7 +111,7 @@ services:
     volumes:
       - /tmp/artifacts/${JOB_NAME}/sproxyd:/logs
   vault:
-    image: ghcr.io/scality/vault:7.76.0
+    image: ghcr.io/scality/vault:7.85.0
     profiles: ['vault']
     user: root
     command: sh -c "chmod 400 tests/utils/keyfile && yarn start > /artifacts/vault.log 2> /artifacts/vault-stderr.log"