Bump scality/vault from 7.83.0 to 7.84.0 in /env/default

Bumps scality/vault from 7.83.0 to 7.84.0.

---
updated-dependencies:
- dependency-name: scality/vault
  dependency-version: 7.84.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

env/default/values.yaml

@@ -9,7 +9,7 @@ cloudserver:
   image: ghcr.io/scality/cloudserver:9.2.24
 
 vault:
-  image: ghcr.io/scality/vault:7.83.0
+  image: ghcr.io/scality/vault:7.84.0
 
 s3_metadata:
   image: ghcr.io/scality/metadata:9.1.0-standalone