chore(deps): Bump velero/velero in /charts/velero

Bumps velero/velero from v1.15.0 to v1.15.1.

---
updated-dependencies:
- dependency-name: velero/velero
  dependency-type: direct:production
...

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

charts/velero/values.yaml

@@ -33,7 +33,7 @@ namespace:
 # enabling node-agent). Required.
 image:
   repository: velero/velero
-  tag: v1.15.0
+  tag: v1.15.1
   # Digest value example: sha256:d238835e151cec91c6a811fe3a89a66d3231d9f64d09e5f3c49552672d271f38.
   # If used, it will take precedence over the image.tag.
   # digest: